Provent-a-mite for mites. You'll need newspaper or paper towel substrate until the mites are gone, daily soakings.....which is going to be fun for a GTP....expect bites. Don't spray the PAM directly on any of the animals, it's for the enclosures only.
http://www.pro-products.com/index.ph...d=53&Itemid=59
As far as bites go, if you were worried about getting bit, a GTP was probably a bad decision. They are not exactly hands on snakes, and from what I've heard adult GTP bites are more painful than you can imagine.
I'd be sure to PAM your ball python since the likelihood of them spreading to whatever reptiles you have are almost certain.