Don't limit yourself to just fondant molds - I use clay molds and i have read on here where people are using soap molds - just make sure that you buy them new, wash them and use corn starch so that they come out cleanly.
Good luck!!!
You can use candy molds too. Dust the inside lightly with cornstarch before you press the fondant in, and then put the filled mold in the freezer for a couple of minutes.
Hobby Lobby has more candy molds than Michaels, usually...I just bought champagne bottle molds and checkers molds (figure I can use the checkers to make gold coins) when I was there the other day. I didn't notice any crabs but I wasn't looking for them in particular.
If you have time to order a mold, here's one: http://www.candylandcrafts.com/Catalog/google/N-52.htm
I just found this great store on-line and they sell hundreds of "cookie" molds ...
www.houseonthehill.net
Have fun browsing, I am ...
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