NEW YORK (CNNMoney) -- Sure, packs of T-shirts and socks are getting expensive because of skyrocketing cotton prices. Guess what else is made of cotton? The dollar bill in your wallet.
In 2010, the cost of making one note jumped 50% from what it cost the government in 2008.
The government produced 6.4 billion new currency notes last year. Each one cost 9.6 cents to produce, including the cost of paper and printing.
In 2008, it only cost 6.4 cents a note, a tiny bit more than it did in 2007, according to the U.S. Bureau of Engraving and Printing.
With the price of raw cotton at a 140-year high, things could get worse.
It's unclear for now how much more it might cost the U.S. to make dollar bills. However the U.S. Government Accountability Office said paper costs "are a significant portion of the cost of producing $1 notes, but less than half the total cost."
Ordinary paper used in newspapers, books and cereal boxes is primarily made of wood pulp. But the paper on which the greenback is printed is composed of 75% cotton and 25% linen, according to the U.S. Bureau of Engraving and Printing. (See correction, below)
The U.S. buys its currency paper from Massachusetts-based Crane & Company. Crane declined to comment on the story, citing the paper product as "strategic material."
Just last week, the GAO called for replacing the $1 paper bill with a $1 coin, saying that the coins are more durable and do not need to be replaced as often.
The GAO said the switcharoo could potentially save the government approximately $5.5 billion over 30 years, but didn't provide a breakdown of the cost of paper money.
Correction: An earlier version of this story said the U.S. paper currency was 100% cotton. U.S. notes are 75% cotton fiber and 25% linen. Linen is derived from flax.
Herbalife shares tumble after the maker of nutritional supplements reports earnings that fall short of analysts' estimates. More
New annual report from U.S. government shows the long-term prognosis for Medicare has improved thanks to slower health spending, while the outlook for Social Security remains unchanged. More
Online dating site OkCupid found its users were more likely to have conversations when it told them they were more compatible than in reality. More
Actor-founded This Bar Saves Lives had Hollywood connections, but learned Start-Up 101 the hard way. More
Steve Mason, a pastor from California, inherited more than $100,000 in student loan debt when his 27-year-old daughter died suddenly in 2009. With interest and late penalties, the debt has since ballooned to $200,000. More