From what I've seen usually if it has super dwarf and dwarf the price shoots up, $1,000 - $1,500 is pretty typical for a purple albino, it's also het for Anery. If it was pure mainland with no SD it would probably be about $350, I think mainland is a harder sell since they get much bigger.
I have a Woma python that was a terror, he just snapped out of it when I put him in a tub in a rack and became super mellow almost overnight. Previously he was in a glass tank under a hide.