My original question was about an inexpensive temporary thermostat, not the planning of my finances. I'm not trying to be critical of your statement but it's just none of your business. I currently have my snakes in tanks, regulated for temperature in case anyone was wondering, and I'm simply eager to put them in my new rack. I am also starting a new job, which isn't pertinent to my original question either, but it means at the moment my finances are diverted elsewhere. And a "but" doesn't make you any less critical.
Thanks to those of you who answered my question.