When you say you have two thermostats and one for humidity, do you mean two thermometers and one for humidity? Thermostats are different than thermometers.
I'd look into Reptile Basic's flexwatt: it's cheap (even with shipping), designed for reptiles, and much safer for your animals and yourself/your home than the human heat pads:
http://www.reptilebasics.com/
http://www.reptilebasics.com/heat-tape
For thermostats, I use the VE-200s and really like them:
http://www.reptilebasics.com/thermostats