The Numismatic Guarantee Corporation provides a free online coin price guide which is compiled from several different independent resources. The values provided are based on documented market transactions.
The Numismatic Guarantee Corporation price guide provides average coin prices based on input from dealers, auction houses and collectors. Prices are available for collector and current U. S. coins. Prices at individual dealers may differ from listed values based on market conditions, short-term pricing trends, availability and spot prices for precious metals. It is recommended that coin buyers and sellers seek additional confirmation, such as an expert consultation, of the value of coins before making a coin transaction.