Anthony Caponetto carries a line of rhac. racks. His site can be found here:

www.acreptiles.com/

I have seen others before but can't find them now. Any place that creates racks for snakes often carry small arboreal racks as well. Acrylic or transparent tubs work best with crested geckos, with the appropriate tub heights. As they don't really need heat, skip heat tape etc. when you buy a rack, unless you intend to house them in a room that never gets over 70F. (ideal temp would be 75F)
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PHLdyPayne