are you looking for something to hold a numerous amount of eggs? Or just a single clutch? If just need a incubator for one clutch,dont waste your time buying hovas, buying fridges, and coolers. The cheapest and one of the most succesful ways is to use a 13 gallon trash can, place 8-10 gallons of vermiculite. And measure the weight of the vermiculite and and the water make sure both are the same.

Make sure the vermiculite clumps. Go on ahead and use flex watt in the trash can(STILL TRYING TO SEE WHAT SIZE WILL WORK WELL WITH A 13 GALLON TRASH CAN). Then buy a thermostat, to controll the wattage power that gives you the right temp). Cover it up with an appropiate sized peice of plexigalss.

This method is so cheap and works great. I got this info from dave and tracy barker. Great python breeders