depends

Bedding:

Gerbils-Peavy Mart
Rabbit-Petsmart
Snakes-its soil and peat moss, we dont have any particular place.

Food:

Gerbils-Petsmart
Rabbit-Petsmart
Birds-Petsmart
Dogs-various
Snakes-breed/catch our own
Fish-whoever carries it when we need it.

Toys:

Gerbils-various, we dont buy to many "gerbil toys" we find stuff that looks like it will make a good Gerbil toy and use it. we have pipes from peavy mart, planters from the dollar store etc..
Rabbit-petsmart for some, other are just old teddys, cardboard boxes, golf balls etc..
Dogs-umm nowhere specific, sometimes the dollar store, petsmart, small shops...
Birds-Wallmart, petsmart, some I make myself...

other supplies:

whoever carries what we need, when we need it. not much choice available to us. we may be a major city,but we are not the least but animal orintated, its annoying.