I bought a $40 one on Amazon... it was "okay"... but I never felt comfortable unless I was checking it three or four times a day. I ended up just breaking down and buying a Herpstat II (figured if I grow, it can grow with me for a while). Best purchase I've made in the snake hobby thus far, by far.

Yea, it's hard to lay that much money down, but with one or a few snakes, you're ultimately buying something to protect your $1000.00+ investment. Do you want to trust that to a cheap product?

Herpstat gets my vote.