Herpstat, Helix, Ranco, and Johnson will probably be your best bet. The Ranco and Johnson are On/Off type thermostats, but you can order them with a 6 outlet power strip already pre-wired into it. The Herpstat and Helix are proportional thermostats and you would need to order them with grounded plugs to facilitate a power strip...

http://www.reptilebasics.com/thermostats/

http://www.spyderrobotics.com/store/...=index&cPath=1