Holà Bator are nothing more than a Styrofoam cooler with a very unreliable thermostat, some people have lost clutches because of those.

If you want something that small and in Styrofoam make your own.

The other two mention are expensive for the size and will not get you far, you want to be able to grow into your incubator.

The thing to remember is that the most important component will be your thermostat which will run $100 to $150, the incubator mention lack that and I would personally not trust my eggs to those.

The nest on the market are hotbox and nature spirit, if that is out of your budget consider building your own.

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