Found these on Ebay, this is the link for the 110v version, this vendor also sells a 220v version:
http://www.ebay.com/itm/110V-Temperature-Controller-Thermostat-Aquarium-100V-/260821680155?pt=AU_B_I_Electrical_Test_Equipment&hash=item3cba2f001b
About $22 US shipped.