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They run about $35/each but have some different models with different featurs/functions.
EDIT: Ooops...I might be a little late with that post!
I saw a small model of theirs for 10 bucks, but I'd have to look at it to see if it'll shut power off on the high setting. I'd just hook one up to each timer, set it at 86 degrees F, and run the temp probes to each area I'm growing in.