A store probably isn't going to use PAM simply due to the cost. Remember that mite females travel to lay eggs, so it's not just the snakes that are affected, it's the enclosures, products outside of the enclosures, bags of bedding for sale on the shelves close to where the snake display is, etc. The whole area needs to be treated.
I'd also bet the quarantine area in the back of the store now has mites, as an egg can take up to 30 days to hatch.
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