I use two Hydrofarm ($26 on amazon), one Johnsons ($95 on RBI.com) and a Herpstat ($118 on coldbloodedcages.com) and all of them work decently, even the hydrofarm. I may upgrade in time, but I'd say it works about the same as the Johnsons. I'll probably replace them at least once every year or two since the lifespan of the probe is not listed, but it works well.
http://www.amazon.com/Hydrofarm-MTPR...3265508&sr=8-2
http://www.reptilebasics.com/johnson...stat-pre-wired
http://www.coldbloodedsupply.com/pro...-SHIPPING.html
Edit: the Herpstat is by far my favorite because it's proportional....
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