The stuff at the stores is usually Reptile relief or Zoo-Med's Mite off. Both of which will kill mites on the snake and do work in the cage ....for about a week! Then you will have them worse than before
Do yourself a favor and go ahead and order the provent-a-mite, Two years after I started using it and haven't had a problem since I have two cans on hand for any new arrivals in the Quarantine room