Just finished my first incubator. I got three worm boxes from Walmart. They were pretty banged up, I had to repair a lid to make it work. I used a 12V DC fan from a computer power supply. I had a double light fixture that I put two 60W bulbs in for heat. One would work, but I figured I would use two in case one blew the incubator would still be heated with one bulb. I got a hot water heater thermostat out of a water heater from the recycling center, and a power cord from a computer. I also used a 120V in 12V DC out power transformer for the 12V fan. The repair work on the lid. Pic of the incubator. I used one of the lids to make a shelf in the box for the eggs. I needed a handle to lift the shelf out. I used a piece of cutting board on the bottom and a clothes hanger for the lifting handle. 12V DC fan, pushes hot air from the bottom to the top. Double light socket. Thermostat. A small piece of cutting board as a fan cover. Plexiglass window 9"x9" 1/4" thick, siliconed in place. Total cost for incubator $0.00 I need to get a good thermometer and a hydrometer for it. I put the thermometer from my brooder in it for now to test it. By that one it is holding at 99 deg. I am going to run it this week and see how it works, maybe next weekend I can find some eggs for it.