I know Petco/Petsmart both have a really bad rap for their pet care but I have actually had fairly positive experiences there. My first snake I got (a normal female BP) is literally the best pet I could imagine. She always has perfect sheds, never missed a meal, eats F/T, went from mice to rats with a breeze, and never bites. I will admit I paid way too much for her ($40 because she was half off) but I couldn't be happier with her. I also recently got a crested gecko from Petco and she has also been a great pet. I have actually been really happy with their animals. A few negatives about them though.... When I went to buy my BP who was a hatchling, they REFUSED to sell me a BP if I didn't have a 20 gallon tank as a minimum... I had done some research and I planned on doing a tub setup but the manager told me the only way she would sell me it is if I had the tank. I really wanted the snake so I bought everything she said. I returned everything she sold me 2 days later. Then when I went to buy my crested everything went fine until I asked for CGD. I didn't notice it on the shelf and the girl working told me that they use Leopard gecko calcium supplement. (used for dusting crickets) so I bought the gecko and went to a different store for food. I would say other than their poor information they usually have good animals and they take really good care of them. (at my Petco at least) Last time I was in there they had Kenyan sand boas, a Pastel or "Fancy ball python", and a wide variety of colubrids.

-Alex