Provent a mite is excellent stuff and Matt at MG Reptiles is top notch. Another option is to get generic Permethrin lotion (generally 1%) at any drug store. Since it is made for human lice treatment it will be the consistency of hair conditioner. Put a SMALL amount in a spray bottle and fill the bottle with water. You can then use this solution to spray down the snake (careful around the eyes) and its entire enclosure. Dont rinse it off the snake or the enclosure. I have had mites once and one treatment this way completely got rid of them. Please feel free to email me for more info. Thanks!
Jamie