Reddit reviews Elitech STC-1000 110V All-purpose Temperature Controller Come with 2M Cable Temperature Sensor Probe
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Parts list:
Controller
Power supply
3.2A model (most fans draw 0.5-0.7A, so this is very much larger than necessary)
Fan example
In case you aren't familiar, computer fans are available commonly and cheaply in sizes between 80mm and 120mm. Smaller and larger are around as well. They are nearly all 12V DC as long as it is not for server use (some oddballs are 48VDC, etc). 92mm is what I used here, and it's more than enough for my little 10g shrimp tank.