Ditto, there really aren't. But you can do a really nice 1 or 2 or even 3-clutch cooler incubator for $150. Spend $100 on a nice "proportional" thermostat from Herpstat or VE or Helix, and the check out the DIY forums for some examples.

It's what I did for my lavender albino clutch this year, and I'm really pleased with the results.