If you are on a budget, check out the Hyrdofarm thermostats on Amazon...they work great for the price and are adequate for a small collection.
And flexwatt is definitely the way to go. You can get it for dirt cheap, and even cheaper if you know how to solder and you wire it yourself.
EDIT: Just saw that nimbly already mentioned the Hydrofarm...they are definitely a reliable entry level stat
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