I am relatively new to the herp life and from what I've read, You really don't want to go cheap with your thermostat. I was thinking about going cheaper as well but seeing as how these snakes are going to live 15+ years, I would rather have something that I didn't have to worry about and that is reliable. I went with a Herpstat 2 from spyder robotics. But if you really can't afford something like that then I've heard the hydrofarms are decent and have 3 plugs for heating devices. http://www.amazon.com/Hydrofarm-MTPR...ords=hydrofarm
Just my 2 cents, best of luck with your new snakes !