Another thing you can try to help keep the humidity up is to use a larger water bowl (one with more surface area), and to put it closer to the warm side of the tank. And I haven't had any issues with humidity in my "rack" set up using plastic storage bins. It's pretty cheap to set up a basic plastic tub set up (though it won't look as nice as a PVC enclosure). The plastic bins and PVC enclosures are definitely much better at maintaining proper humidity than glass tanks.
http://ball-pythons.net/forums/showt...e-Basics-*DUW*
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