So long as you never go to a store where there are reptiles or reptile feeders or go to a herp show, or go to a friend's house where they keep reptiles... You're probably pretty safe. Sometimes mites can come in on bedding, but I think it's pretty rare. Usually the only kind of mites bedding brings in are wood mites which while annoying won't harm your snake.
Get yourself a can of PAM anyways, just in case something does happen. Then you'll have it on hand and if you get mites your snake won't have to be uncomfortable waiting for it to arrive.