I see a lot of entry level keepers suddenly "under the gun" looking for a thermostat to control their UTH or other heating device in their cage.
I'm sold on Herpstats, but I recently had to move my Herpstat-II to control the RHP's in my 2 larger cages. My Herpstat-I went to the smaller glass cage, but that setup uses a lamp for ambient temps and a UTH for belly heat so I needed another way to control the UTH since the Herpstat-I was going to control the light.
I decided I'd try the Hydrofarm MTPRT heat mat thermostat. I paid $31.64 with shipping and I have my UTH set at 91 and it's dead on at 91.
I'm pretty impressed with this inexpensive little unit, and would recommend it for UTH purposes. I would not use it with a lamp, and have not used it in any other capacity, but I can say it works great for the application I'm using it in.
Check out Amazon if you need one in a pinch!!