The CoinSite features a free price guide for old paper currency on its website. The guide features prices for $1, $2, $5, $10, $20, $50, $100, $500 and $1000 notes dating back to 1928 when U.S. bills were first reduced to their current size.
From common issues to rare variations, the price guide provides the current market values of each bill in both average and uncirculated condition. The site provides a grading key as a reference to give collectors an idea of the condition of their bills. The experts at The CoinSite also offer descriptions and free prices of "error" paper currency on their website.