I have the picture window one with no fan and have it connected to a herpstat thermostat.
For the egg container, I used a simple small rubbermaid tub with a snap on lid.
I have a humidity probe that I use to monitor the humidity.
For about $75 you can get the hovabator, the digital humidity probe, the egg chambers, the candling light, and the medium. The most expensive part is the thermostat ($100 for the herpstat) and IMO the most important part as well.
Next season though I am upgrading to a natures spirit incubator.
You can't fit many eggs in the hovabator. I am lucky this year in that once these guys are moved out into the hatchling rack, it will be about the same time the next clutch will be layed and ready to go in so I was able to spread it out a bit.
More than 2 clutches in at once would be pushing the limit of a hovabator.

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