I recently searched for temperature controllers for my other hobby -- homebrewing.
Of course "cheap" is all relative, but you might look into the following links:
http://www.marine-monsters.com/front/products/lcdtempcon.html
http://www.williamsbrewing.com/AB1605000/showprod.cfm?&DID=7&User_ID=29548&st=9562&st2=-47354763&st3=-83556895&CATID=12&ObjectGroup_ID=72 (This is the one I bought) http://www.stpats.com/tempctrl.htm http://www.brewsource.com/ProdNav/Eq_557.asp http://www.northernbrewer.com/chilling-etc.html
If you're a DYIer, you can get even cheaper by building it yourself: http://www.macatawa.org/~dkerfoot/schemat.html http://hbd.org/mtippin/tempcont.html
Of course "cheap" is all relative, but you might look into the following links:
http://www.marine-monsters.com/front/products/lcdtempcon.html
http://www.williamsbrewing.com/AB1605000/showprod.cfm?&DID=7&User_ID=29548&st=9562&st2=-47354763&st3=-83556895&CATID=12&ObjectGroup_ID=72 (This is the one I bought) http://www.stpats.com/tempctrl.htm http://www.brewsource.com/ProdNav/Eq_557.asp http://www.northernbrewer.com/chilling-etc.html
If you're a DYIer, you can get even cheaper by building it yourself: http://www.macatawa.org/~dkerfoot/schemat.html http://hbd.org/mtippin/tempcont.html