Tandy is in Tucker, just outside of Atlanta. They are a chain so there might be more of them around - I never really checked.

They carry rivets and belt loops and the like, but I didn't see any kydex in there. I ordered my kydex, rivets, and some belt loops online through knifekits.com - I would have ordered the rivet setting tool from knifekits, too, but they are out of stock. Hopefully the one from Tandy will work with my rivets, since I bought a hundred pack of them.