HCA: Hermit Crab Association

So we went on vacation to Virginia Beach a week ago and of course every gift shop had hermit crabs. I have 2 young kids so obviously we came home with 2 pp's. I of course knew when we were buying them that the habitat and care instructions they gave us were not going to be what we really need so I h...

Is there a place that sells like a big bag of multiple sizes that are suitable for crabs?