I have this one and have had really good success with it. Tractor Supply carry’s them.I use one of these, and Manna Pro Harris Farms Nurture Right Egg Incubator. They run under $200 new. If you buy a used one, make sure you sterilize it well for disease.
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There are much better ones out there, especially if you are doing large numbers. But for our small needs, this one works well. I have great hatch rates, assuming I follow some basic rules.