The least expensive way to take care of the humidity dilema is a humidity box. My vet recommended it, so I tried it, and it's worked beautifully since. Here's the "how to":
It's very simple actually. You'll need:
* a TupperWare type container. Size accordingly.
* a sharp object to cut through the plastic. (I used a small saw)
* and some moss or another absorbent substrate. (You can use a cut-out piece of towel, CareFresh substrate, Sph. Moss and a number of other things i'm not thinking of i'm sure)
That's it.
Take the substrate and make it damp, like a well rung towel, and place it in the humidity box(I actually make it a bit more wet than that, but the vet recommended the "well rung towel" version). Make sure you cut the hole on the top or on either side. Place it on the warm side of the enclosure and your set yo go.
Your going to want to clean it and change the substrate weekly. If the substrate is soiled, replace it.
You can also check out the HabbaMist from ZooMed. It's a mister on a timer. You can set duration of spray and intervals. One drawback is that it's loud. It is effective though.
It has tubing that goes directly in the enclosure and sprays where you direct it, not the whole enclosure.
Hope this somewhat helps.
RayRay