http://www.spyderrobotics.com/products/index.html They make the Herpstat and you can order directly from them.

http://helixcontrols.com/DBS1000.htm You can order the Helix from here if you are closer to the west coast or order from

http://www.reptilebasics.com/Thermostats-p-1-c-250.html if you are closer to the east coast.