To purchase sanddollars go here
Here are some of the various types are sanddollars. Great for identifying which ones you have found.
Sand dollars are of the Phylum Echinodermata, class Echinoidea. They, like the sea urchin, have no arms or legs but move around by tiny spines on their body. Sand dollars are usually found lying in a bed buried under a layer of sand. If a sand dollar is found alive it will appear to have a layer of very fine hair on its body. These are the spines. They are a slow moving grazer that feeds on disintegrating organic material found within their sand beds. There is a story of the sand dollar that is an extremely popular legend
To see what a live one you find would look like go here
To see how to preserve a sand dollar go here
Here are various forms of sand dollars: