I know it is over priced and I plan on exchanging it, and I've heard people here talk about getting dimmer switches from places like home depot for like $10. Can anyone link the exact item they have used or seen used? I plan on getting a real proportional thermostat in the future but until then I need to use a cheaper option.
You can found dimmer switch from lowes http://www.lowes.com/lowes/lkn?actio...-WH&lpage=none however if your room temps is un-stable it will allow fluctuation.

If you are in the process of getting serious with this hobby and build a rack it will be a VERY good idea to invest in a reliable thermostat.

http://www.spyderrobotics.com/products/herpstat.html

http://www.reptilebasics.com/Thermostats-p-1-c-250.html

Also, what type of screws should I be using for melamine? And any specific type of casters for a 4ft tall melamine rack?
I use drywall screws, work perfectly, and remember a pilot holes are always a good idea.