If the prey is small then you snake may be absorbing most of it for nutrients, so it may take a while to build up a deuce...
Here is a website that you can get thermostats from. There are several others, depending on how much you want to spend...
http://www.reptilebasics.com/thermostats/
http://lllreptile.com/store/catalog/...ts-and-timers/
http://www.bigappleherp.com/REPTILE-...ES/Thermostats
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