I live in Phoenix Arizona and keeping humidity up has always been a challenge for me. The most recent substrate I have had success with is Eco Earth from ZooMed. I have a PVC enclosure and I have gone almost a week so far without having to mist the cage. One thing I would say is with this type of substrate is it holds humidity really good, almost too good. I had to "air out" and remove some of the substrate from my cage a couple of times at first to keep the humidity from getting too high.
http://www.petco.com/product/10813/Z...Substrate.aspx
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