I bought PAM just last month from a reptile store and I've seen it all around Petsmart...
If you want to treat the snakes immediately, soak them in water with mild soap. As well, get something by Zoomed called Mite Off. It's safe to use on the actual snake and the Mites will disappear within 48 hours. It's the only thing that got mites off Pandora when she had them.