It's hard to not buy something like that if you really want it. With a boa, I would personally look at buying from a reputable breeder. With Petco I would say to check out all of the other herps there. I've seen mites more times than I can count at those stores, but your Petco could be a good one. That's a bit pricey. If they really want to move it and you decide to go for it maybe you can bring in some KS ads to show them what they're actually selling for. I don't think they will normally deal like that, but if they really feel the need to free up the space then it's worth a shot.