I don't know about the best but i would avoid the ones they sell at tractor supply. I would look for one with a digital thermostat so you can set it to the desired temp and it will turn on and heat up if the temp drops. The ones from TSC don't do that. If its 72* in your house and you get it set to 100* in the incubator and over night the temp drops in your house the temp will drop in the incubator as well. It's very annoying unless your house stays a constant temp night and day.