There's a PetCo in my town, along with two locally-owned pet stores. Sadly, the locally-owned pet stores keep their reptiles in even worse conditions than PetCo, if you can believe that.
In one, I saw two leopard geckos in the same small tank, with absolutely no lighting or CHE or heatmat. I couldn't believe my eyes. I DID look thoroughly on the bottom of the tank for any signs of a heatmat--any wires behind the cage, anything. The glass tank was flush with the bottom and there were no wires and no overhead heat for the geckos. The two geckos inside looked absolutely close to death, with their legs and tails very very thin. I wanted to cry. There were some crickets hopping in the tank with them.
In the other one, I saw a ball python that looked only a little bigger than a hatchling, and it was incredibly skinny. There was a live mouse fuzzy in front of it.
As much as I hate PetCo, I've actually found that--in my town--it's the most humane of the three when it comes to its reptile care.
Are you management at PetCo? I've read that it's store policy to feed their ball pythons mouse pinkies; is that true at your store?
Also, WHY do no pet stores ever have proper humidity for their balls? Does PetCo enforce humidity requirements? Most pet stores just use those glass tanks with mesh lids.