I personally think it's disgusting and cruel where these animals come from.
There's only ONE pet store I support, and it's LOCALLY owned, in fact, I'm on a first name basis with the owner. ANY and ALL his animals he breeds himself (he does NOT sell cats or dogs, but has info about adoptable animals from the local shelter). He's a major animal person, and no creature in his shop goes without vet care, even the rodents and fish. Well, okay, the fish he medicates himself, but, he has his vet tech, so it's still technically vert care.
He'll ONLY sell quality food where MEAT is the #1 ingredient, and if he can't answer your question, he'll phone an expert right then and there, put them on speaker, and have YOU ask them personally.
Sadly, he's slowly going under at about $20,000 in debt because of the big chain pet stores that have all the 'bells and whistles' that he can't possibly afford.
Anyways, don't but from pet stores that support millers, plain and simple as that!