Let's see if I can remember...I worked at Petco for 3 years. Red tails come from some place called California Zoological, we used to call them CalZoo...beardies and I think cresties and leos come from Sandfire Dragons...and the rest of the reptiles come from a place called Amazon something or other. The guy that runs it is a real piece of work, he was always sending me WC herps, and then when I would call him to ask about why they had mites ect. he would deny it. He once tried to tell me that Flying Geckos ALWAYS have mites no matter what. He also sent us a Red Foot tortoise that was COVERED in ticks, and when we took her to the vet, they turned out to be south american ticks. Now tell me how you get south american ticks on a captive bred animal? The vet reported him for that one, so he may have been shut down by now. I sure hope so.
That was just my store, though...it may be different for others.