You've already gotten good feedback here so I won't repeat anything other than the advice about if you do go back, please immediately toss your clothes into a plastic bag as soon as you step into your home (I mean literally as you step through your front door) and launder them. Thoroughly wipe your shoes, including the bottom, with bleach or disinfectant wipes.
Yes, I sound paranoid. I have good reason for it - I deal with many new keepers and over the last few years I am seeing ever-increasing reports of animals with not only mites, but a significantly increased incidence of the big viral illnesses that are so terrifying to us as keepers because there is no treatment or cure for them.
Anyway, in terms of what you can do - even realizing that a pet shop can (usually) not be expected to maintain the husbandry standards of a private keeper, what you describe here is problematic. I'd go ahead and submit a report to your local animal control office. Depending on where you are, they may or may not be knowledgeable about reptiles but it is still worth reporting. Good luck.
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