Hey there, for those of you using an electric roaster and considering a PID unit, or wanting to lock-in optimum temp for a cheese cave, I found this:
http://screwdecaf.cx/yatc.html (http://screwdecaf.cx/yatc.html)
$60 to assemble it yourself and $80 pre-assembled. I don't have one and don't use a roaster, but looks like it could work!
V
Or you could order an alternative (http://www.amazon.com/RANCO-ETC-111000-Digital-Temperature-Control/dp/B0015NV5BE/ref=sr_1_1?ie=UTF8&qid=1315026905&sr=8-1) that may be a little less intimidating for those less electrically inclined.
I have one and it works wonderfully.
-Boofer-
I have one of those also Boofer- it works really well.