CoinTracker and HeritageAuctions are both websites that offer comprehensive lists of rare, collectible pennies and their possible value. Lists such as these also include the years in circulation and the average amount of coins circulated.
When buying and selling collectible and rare pennies, research is important so that buyers are aware of appropriate costs of the coins they are searching for. Comprehensive lists are easy to find with a simple Google search, with lists being found on websites such as CoinTracker and HeritageAuctions. The latter site is designed especially for beginners. These lists are also useful in identifying valuable pennies.