I have a cabinet that I made a few months ago, and it only cost me $167 to build. It can hold about 160 chicken eggs and about 300 quail eggs. I made it out of an old dresser and a gqf heating element hooked to a hot water heater thermostat. For a fan I used 2 pc fans mounted to the top. The temp differs about 1.5*F from side to side. It is currently out of commision due to a wiring problem with the heating elements.