For the average American heading to the supermarket to buy Thanksgiving dinner, bringing a $50 bill should do the trick.

The average cost of a 10-serving Thanksgiving dinner will cost $49.48 this year, according to a study by the American Farm Bureau Federation, a nonprofit grassroots organization advocating farmer interests. The group relied on 150 volunteer-shoppers across the country to price out traditional Thanksgiving menu items including turkey, rolls and pumpkin pie. Based on their findings, we identified how much foods have changed in the last year and those that are more or less expensive.

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With the United States having experienced its worst drought in decades this summer, there has been much concern about rising food prices. Yet the price of a Thanksgiving dinner in 2012 increased just slightly from its cost of $49.20 in 2011. In fact, of the 12 items calculated by the AFBF for the dinner, eight got cheaper compared to last year, while only three became more expensive.

“All the talk that there has been about the drought … sort of fed this expectation that we’d see a big jump in the Thanksgiving dinner price survey,” AFBF Deputy Chief Economist John Anderson said in an interview, but added, “I’m not terribly surprised by this result.”

Anderson noted that the effects of the drought haven’t been incredibly evident in retail prices yet, since decisions about retail strategy and pricing for Thanksgiving are often made “months, or at least weeks” in advance. The drought effects will hit consumers’ wallets hardest within the next three to six months, Anderson explained. But prices in the coming months will be determined based on many other factors, including energy prices, the overall strength of the economy and the continuing behavior of Mother Nature.

Although the cost of a Thanksgiving dinner barely changed from 2011, it is significantly higher from $42.91 back in 2009 and $43.47 in 2010. Anderson explained that prices as a whole were still rising during the years of the global recession due to higher demand worldwide, but retailers were reluctant to pass along those costs to consumers. “Consumers were just incredibly cost conscious during the recession,” Anderson said. By 2011, however, the economy was on strong enough footing that retailers began charging higher prices.

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24/7 Wall St. reviewed the items on the AFBF’s report on the cost of Thanksgiving dinner to gain perspective on price shifts of food, including 16-lb. turkey, 12 rolls, 1-lb. relish tray of carrots and celery, 1/2 pt. of whipping cream, 14 oz. of cubed stuffing, 3 lbs. of sweet potatoes, 1 gallon of whole milk, 12 oz. of fresh cranberries, 1 lb. of green peas, 30 oz. of pumpkin pie mix and two pie shells. We considered data from the U.S. Department of Agriculture to identify changes in production for various commodities to determine why food prices may have changed. We eliminated the 1-lb. relish tray of carrots and celery from this list because the price stayed the same at 76 cents. We also eliminated miscellaneous ingredients from the list because the measured amount of some of the items was too small.

These are the Thanksgiving items rising or falling in price.

 Price Losers

1. Pie Shells (2)
2012 price: $2.51
2011 price: $2.52
Price change: -$0.01
Pct. change: -0.4%

While the price of grains has been rising, that hasn’t made it into packaged items such as pie shells yet — the price of pie shells actually dropped one cent year-over-year based on the AFBF study. Anderson said that for many foods, notably packaged foods such as pie shells, the way major retail chains market the items and how much to stock on the shelves could lead to slight price fluctuations year-over-year.

2. Pumpkin Pie Mix (30 oz.)
2012 price: $3.02
2011 price: $3.03
Price change: -$0.01
Pct. change: -0.3%

It was a mixed year for pumpkin producers in 2012. While some producers complained the national drought hurt their crop, others said the drought actually benefited them since pumpkins tend to thrive in warmer weather. Anderson pointed out that unlike major crops such as corn and wheat, pumpkin production takes place on a much smaller scale. This allows pumpkin growers to mitigate the effects of negative weather on their crops compared to other farmers. He also noted that pumpkin growing season takes place at different times depending on location, helping to spread out the risk of a bad production season.

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3. Green Peas (1 lb.)
2012 price: $1.66
2011 price: $1.68
Price change: -$0.02
Pct. change: -1.2%

It’s been a good year for bean producers, which includes pea producers. Although the Department of Agriculture doesn’t specifically track the production of green peas, it noted in a recent report that dry bean production is expected to be up 35% in 2012. In Michigan, where peas constitute roughly a third of all dry bean production in the state, yields are expected to rise a more modest 4% in 2012.

4. Fresh Cranberries (12 oz.)
2012 price: $2.45
2011 price: $2.48
Price change: - $0.03
Pct. change: -1.2%

Although lower yields tend to lead to higher prices, this hasn’t been the case with cranberries. Production of cranberries is projected to be slightly less than last year, according to the most recent estimates by the Department of Agriculture. Cranberry vines faced heat stress in parts of the country due to high temperatures in the summer. But other places had less problems. Wisconsin, which produces 57% of cranberries in the U.S., is on track to produce 2% more than in 2011. The department noted that growers in Wisconsin “reported excellent pollination and limited impact from the summer’s high temperatures and dry conditions.”

5. Whole Milk (1 gallon)
2012 price: $3.59
2011 price: $3.66
Price change: -$0.07
Pct. change: -1.9%

Milk prices are lower than last year due to extra supply built up during last winter’s mild temperatures. The low milk prices, along with the high feed costs, have put enormous financial pressure on dairies. Dozens of dairies located in California, the largest producer of dairy products of all states, have recently filed for bankruptcy. To combat the low prices, cows are now being slaughtered at high rates. Already, this has led to an ascent in dairy prices in the last few months and could lead to record high dairy prices in 2013.

6. Sweet Potatoes (3 lbs.)
2012 price: $3.15
2011 price: $3.26
Price change: -$0.11
Pct. change: -3.4%

Although the country’s drought has led to a lot of crop damage, that hasn’t been much of a problem for potato farmers. The Department of Agriculture notes that potato production is expected to grow by nearly 7% this year. Idaho, where more than a third of the nation’s potatoes are produced, grew its production by 11% in the fall season. The market value of the potatoes produced in 2012 is expected to rise by nearly 10% to $4.4 billion.

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7. Cubed Stuffing (14 oz.)
2012 price: $2.77
2011 price: $2.88
Price change: -$0.11
Pct. change: -3.8%

The price of a 14 oz. package of cubed stuffing dropped a sizable 11 cents from 2011 to 2012, although Anderson said it was hard to deduce much from this cut. He noted the value of the raw commodities in the stuffing play just a small role in the overall cost of the stuffing, with costs such as packaging, transportation and marketing playing a much larger role. He suspects the price drop has a lot to do with retailers heavily promoting stuffing.

8. Whipping cream (1/2 pint)
2012 price: $1.83
2011 price: $1.96
Price change: -$0.13
Pct. change: -6.6%

Of all the Thanksgiving groceries, the price of whipping cream has declined more than any other, which can be attributed to the price of dairy products. Although fluid milk prices have begun rising due to the cow slaughtering, those prices have yet to be reflected in packaged food. But this won’t last forever. The Department of Agriculture predicts those prices will be fully reflected within the next 10 to 12 months.

Price Gainers

1. Rolls (12)
2012 price: $2.33
2011 price: $2.30
Price change: +$.03
Pct. change: +1.3%

Wheat prices have risen in recent months due to drought, which caused a supply shortage. The upcoming harvest season is not looking much better. Only 36% of this year’s winter wheat was rated good or excellent — the quality most used for making wheat products. Last year, 50% of the wheat was rated good or excellent, according to the Department of Agriculture. Similarly, this year 22% of the what was rated poor or very poor compared to only 14% last year. Drought conditions in other countries such Russia and Ukraine also hurt crops there, further pressuring wheat prices higher.

2. Turkey (16 lb.)
2012 price: $22.23
2011 price: $21.57
Price change: +$.66
Pct. change: 3.1%

Unfortunately for Thanksgiving diners, the most expensive item on the shopping list was also the item that rose in price more than any other. Prices have risen compared to last year due to droughts affecting the Midwest, which have increased the price of turkey feed. Worse, drought effects on turkey prices are expected to last through at least 2013. The increased turkey prices have left many charities hosting Thanksgiving dinners facing a turkey shortage.

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Lisa Peardon / Getty Images stock

Retailers locked in their prices for turkeys this year, so Thanksgiving won't break the bank for most Americans.

Americans will be able to enjoy relatively cheap Thanksgiving turkeys this year, thanks to many retailers locking in their costs before a drought this year drove up U.S. feed prices.

And retailers are determined to keep prices for the traditional Thanksgiving main course as low as possible, even though sky-high corn prices have nearly doubled the cost of producing a pound of turkey meat this year.

Offering attractive prices for turkey can help retailers such as Wal-Mart Stores Inc and Supervalu Inc lure customers into their stores for other Thanksgiving staples such as turkey stuffing, cranberries and sweet potatoes, industry sources said.

"Like the rest of the industry, we're seeing an increase in the prices on turkeys," said Mike Siemienas, spokesman for Supervalu Inc, the third-largest U.S. grocery store operator. "We continue to work with suppliers to ensure we're getting the best price possible for our customers."

Retail prices for frozen turkeys have barely moved in recent weeks. Whole frozen turkeys were selling for $1.62 a lb in September, up from $1.57 a lb at the same time two years ago, according to the U.S. Department of Agriculture's Economic Research Service.

One reason for that is many producers' contractual prices with retailers were set this spring when feed was far cheaper as U.S. farmers began planting what looked like would be a record corn crop.

The expectations for a bumper autumn harvest evaporated as the worst drought in half a century devastated crops and sent corn and soybean prices to record highs this summer.

The impact of higher feed costs are beginning to show up at some supermarkets that did not lock in pre-drought prices.

A manager at Paulina Market in Chicago said the meat market recently increased the price of their fresh turkeys by about 50 cents a lb to $3.75 a lb.

At Casey's Market in a Chicago suburb, owner David Casey said his wholesale suppliers are quoting prices that are "up a couple ticks, about 5 percent."

The surge in grain prices were also making it more difficult for some producers to secure bank loans.

John Burkel, a turkey grower and processor in Minnesota, said the rising grain prices can make it difficult to obtain bank financing.

"I used to feed a turkey for 22 cents a lb, now it costs 45-50 cents," Burkel said. "When you go to the bank and say, 'I need a line of credit that's twice what I typically have,' they look at you and say, 'Are you out of your mind? How are you getting that back?'"

In 2011, the United States produced 5.79 billion lbs of turkey - a 7.4 percent drop from the 6.25 billion lbs produced in 2008, according to USDA data.

The nation consumed about 5.02 billion lbs of turkey in 2011 - 6.6 percent less than the 5.37 billion lbs in 2008.

Industrywide, farmers and processors say they have scaled back their flocks, and further production cuts are expected as grain prices remain high. September's egg set placements fell 6 percent from a year earlier, according to USDA data.

Jim Hertel, managing partner of Illinois-based food retail consultancy Willard Bishop, cautioned that even if turkey wholesale prices continue to rise savvy retailers will eat as much of the difference as possible.

"Smart retailers will be looking to absorb the costs they can, and spread any of the price increases across other categories that haven't been as hard hit," Hertel said.

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Getting the family together for Thankgiving dinner? Priceless. The cost of the meal with all the fixin's? About 1.3 percent more expensive this year than in 2009.

For all the talk about low inflation, prices have started to creep up for many food items, including corn and milk, since Thanksgiving 2009.

The American Farm Bureau Federation, which calls itself "the voice of agriculture," says the average cost of this year's meal for 10 will be $43.47, 56 cents higher than last year's average of $42.91. It's a bit of a bargain, though, because it's still $1.14 cheaper than it was two years ago.

The main attraction of the feast, the bird, actually costs less this year, at $17.66 for a 16 pound turkey, according to the AFBF, which has been tracking the costs since 1986. But among the key items that cost more are: milk (up 38 cents to $3.24); a 30 ounce can of pumpkin pie filling (up 17 cents to $2.62); two nine-inch pie shells (up 12 cents to $2.46); and three pounds of sweet potatoes (up 7 cents to $3.19).

Of course, this all means nothing if you serve something like roast beef instead of turkey on Thankgiving. The average cost of prime rib is $5.29 a pound this year, up from $5.11 last year, a gain of 3.5 percent. Ouch!