Provent-a-mite is the stuff! You use Provent-a-mite to treat the enclosure, while Reptile Relief (made by deFlea) also quickly knocks out any adult animals on the snake itself.

LLLReptile sells a package deal of Provent-a-mite and Reptile relief for less than $30 shipped to you door. That's probably going to be your best value right there. I ordered from them and received it about 5 days later, I'm in VA and LLL is in Cali if I'm not mistaken.

In the mean time, you can soak your snake every other day or so in a mild mild mild soapy solution, the soap in the water helps kill more mites faster. Clean and disinfect the enclosure as well. The more you stay on top of them, the easier it will be to erradicate them. With the right tools, its pretty easy to get rid of them in a small collection. Its a decent learning experience to have, although I'd never wish it upon anyone.

Let us know how it goes!