Geocoins are specially minted coins designed by geocachers and traded and collected. In some regions, geocoins of any type are very rare. Most are collectable.
Among the most sought after are Moun10bike geocoins, which are the first ones.
Most geocoins are trackable on various websites. Anyone can design their own and have it trackable on the geocaching website, at a tracking cost of $1.50 per coin and a $150 one-time fee. The minimum limit is 500 coins. More and more people are starting to have their own coins minted and tracked.
For more information on geocoins, visit http://www.geocoin-info.net