I think the quality all depends on who runs the reptile section. I've seen some good ones and some poor ones, and it doesn't seem to matter much if it's a big-box or a mom and pop outfit. Get someone running it who is knowledgeable and cares about herps, and it'll most likely be a good one.
I have never been to a pet store yet that had proper caging for veiled chameleons. Even the good ones dont seem to provide adequate ventilation.
1 adult bull snake: "Dozer"; 1.1 juvenile bull snakes: Oscar and Phoebe; 3 baby red-sided garters; 1.1 macklot's pythons