Like posted earlier, each store is different although most of them are fairly uneducated in the care of reptiles. The Petsmart by my house where I got my high white pied girl actually takes decent care of their pets and gets them checked by an actual reptile vet, one of the best here in Washington state. I quizzed the manager before I bought her asked her which vet they use and she told me which one who is the one I know so I know their animals get checked up by a good vet. Now the next town over from mine, they have a Petco that is HORRIBLE. It seems to me that most of the Petcos or at least the 3 in my area take pretty piss poor care of their reptiles while the 2 Petsmarts in my area take fairly decent care of them. They still don't really keep them warm enough imo but at least they aren't mite infested with sores and have snakes as thick as toothpicks. And I agree, the best bet is buy from a reputable breeder but I couldn't pass up the $200 black Friday deal for that 6 week old high white pied girl who now after 1 week with me has gained 18 grams(up to 120 grams) and eats like a horse and now I am starting to work with getting her used to me.
And definitely call that number. I mean they probably wont do much as the chain stores are all about the bottom line but it cant hurt.