I don't use an incubator, I just have container I put all of my eggs into.
Pics of my "incubator" are at the bottom of the first post:
http://ciliatus.com/forums/index.php/topic,5300.0.htmlI'd only use an incubator if it is too cold or temps are on the low end and extremely unstable. I guess you could use one of those foam coolers with no heat added if you just want temps to be more stable- just put your egg containers in that and leave it closed.