Commemorative coins are one of the most popular coins among coin collectors. They are coins that issued to commemorate special event and people and usually they are for collectors only, only small percent of commemorative coins go for regular circulation. Most of commemorative coins were issued after 1960s. Here are some exmaples of commemorative coins: US 50 State Quarters and Soviet rouble of 1965 which commemorating the 20th annversary of the victory in WWII, Twenty-five pence issued in 1981 to commemorate Royal Wedding of Charles and Diana.

Here are some US commemorative coins for sale on eBay.