Right now I'm using a Brinsea bird brooder. Its big and I can fit lots of eggs in there.
For smaller egg quantities, the best way to go is with a "Little Giant" or a "Hovabator" still air incubator. These are cheap, reliable, simple, and effective.
Most of the lower end ones marketed for reptiles have a lot of flaws and problems. I have not used the expensive $1000+ larger ones for reptiles, so I have no experience to relate with those.