Looking for a thermostat again

I'm looking for a thermostat for Flexwatt heat tape and am having difficulties. I'd like either a Ranco or a Johnsons, but the only ones I'm finding are for heating systems and refrigerators. Could someone please give me a model number for the kind of Ranco/Johnsons thermostat I'm looking for?

I have had very good success with Herpstats so far, depending on how much you want to spend and what you are hooking it up to. www.boaphileplastics.com has what I think you are looking for though.

Reptilebasics.com sells the reptile versions.