If you're looking for an alternative to Nix, check out the VPI web site the war on mites. http://www.vpi.com/
After reading this site, I decided to go with Black Knight. Ordered it on-line and after the first treatment- no mites. Treated twice more just to be safe and still no mites. I now have a can that will hopefully last the rest of my reptile keeping career if I'm careful. It's more expensive that mixing up our own Nix solution, but I wanted something easy. The main thing to keep in mind is that you can't just treat the snake, you have to treat everything (cage, shelves, furniture in the room, carpet, you name it). Until you begin your chemical treatment you can soak the snake regularly to reduce irritation from the mite bites (and drown some of those little suckers!) and keep totally cleaning the cage daily to reduce the numbers in the cage.