Unfortunately the mite eradication process requires getting rid of natural substrate and wood from the snake's enclosure and using treated paper and plastic hide boxes so the mites can't hide from the insecticide. I doubt the manager at PetSmart will go for that.
To avoid bringing mites home to your own collection get yourself a can of OFF and spray yourself with it in the parking lot before you get into your car when you leave work each day. When you get home head straight for the shower and then either launder your clothes immediately, or put them in a plastic bag, spray them with more OFF, and close up the bag until laundry day.
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