HCA: Hermit Crab Association

No I live in SC so not extremely hot here especially in the winter.. What is the best kind of heater to buy? And can I purchase them online like amazon? Thanks for the input

I'm new also my son received his first hermit crab back in June named him spidey because he had Spider-Man painted on his shell got a five gallon tank and some sand put a few climbing items on there and a water dish that is like a mini pool he can climb in and out of it pretty easily. I bought a new...