UTH Temperature regulator?

My first recommendation is Herpstat http://www.spyderrobotics.com/store/ (everything I have but one rack runs with it including my incubators), second VE 100 or VE 200 http://www.reptilebasics.com/thermostats

The Hydrofarm ones are great if you're on a budget and can't get one of the other ones. They run around $30 on Amazon.
You can find them on eBay too with free shipping if you don't have Amazon Prime and you wanna go that route, it's what I did.
http://www.amazon.com/Hydrofarm-MTPR.../dp/B000NZZG3S

I use one for each of my tank enclosures.