Like other snails, giant African land snails are prone to aestivation, which happens when it's in an enclosure or environment that is too dry. When this happens in captivity, the snail forms a membrane over the opening of its shell and seals itself inside, hiding the cute, curious face that makes it a good pet, and requiring you to mist and ...
Sorry to hear about gary. It's unlikely you will find anywhere that sells snails. The "typical" pet snails that can be sold in pet shops are various species of Achatina and Archachatina (commonly called Giant african land snails) these are illegal to keep in america and hence you will not find anyone who sells them (atleast not legally!).