Use a heat lamp to heat the cage, and that will drop the humiidity, plus using an aquarium with screen lid, or if you're going with a rack, make lots of air holes.
The geckos at the petco near me are decently looking, and they have a male that is not normal. maybe chocolate albino? I dont' know.
I was going to say, make sure you look at it carefully since they typically keep their geckos on sand, be sure they're using a feeding dish, cags is clean etc...
best of luck with the new gecko snakeheader