Information about current, circulating or collectible U.S. coins is available through the U.S. Mint. The Numismatic Guaranty Corporation offers value and price guides for rare, retired and collectible coins as well as coin collecting purchasing resources.
The U.S. Mint is the sole producer of legal tender in the United States and provides information on all legal currency. In addition to regular currency, information is available about proof sets, uncirculated coins, commemorative coins and medals, as well as guidelines and education on coin collecting.
The Numismatic Guaranty Corporation, through easy to read charts, gives historical data on rare and collectible coins. This site includes most recent changes in coin values, latest selling and auction prices paid, and guidelines for coin quality grading. In addition to the data available, the Numismatic Guaranty Corporation offers quick links to coins that are currently up for bid or for sale.