Thermostats/dimmers and digital thermometers

[BigBADace]

Where's the cheapest and best place to pick thermostats or dimmers and digital thermometers up? I saw a ZooMed rheostat at the pet store for 30 bucks but i think i can do better then that?

and are all the thermostats and dimmers you would see in hardware stores compatable with heat pads and spotlights?

thanks again