While herpstat is the best imo, I have 2 reptitemp 500r's running my 3 snake rack and they work perfectly for 30 bucks each! Keeps the temps perfect and stable with no change as long as the room ambient temps dont fluctuate by more than 6 degrees. It is a proportional though.
http://cgi.ebay.com/ReptiTemp-500R-T...#ht_500wt_1156
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