Well.. It depends. I've heard both Petco and Petsmart get their BPs from Gourmet Rodent. They usually arrive healthy, whether they stay healthy depends on the store and whether the snake will eat f/t. Both places have a policy to only feed (and recommend to feed) f/t. Not all BPs, especially hatchlings, will accept f/t. If they don't, they don't eat, thus the skinny ones you sometimes see. Not all stores provide well for them either, i.e. no hides, just a bare cage with a water bowl and substrate and, at Petco, a bunch of babies stacked in one cage . They stop eating and don't shed well under these conditions too. If they look healthy and have no shedding problems, they are probably OK. Buying from a Herp show, if you can, is a better option. Cheaper and, if from a good breeder, individually housed and less stressed (which equals a better chance of no problems).