I'm with the merchant and will recomment Reptile Basics but I use one of the Vivarium Electronics models they produce. I like the stack-able feature. (I have heard good things about the Ranco therms btw.)
http://www.reptilebasics.com/thermostats
I don't know how good this next items is but I looked into it for a while. It's from the folks at BigApple Herp. Like Ranco it is a sidemount.
http://www.bigappleherp.com/BAH-1000-Thermostat
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