Please show me out to build a cheap incubator!!

I need some advice on how to build a cheap incubator for ball python eggs, I really don't care how it looks, as long as it works. I wouldn't care if it was one of those styrofoam ones. I have a small fridge I maybe able to convert it but I wouldn't know how. The last guy who posted a video on it didn't make it mobile friendly :/ sucks for me. Someone please help :/

There's stickies and a lot of great tips and idea over in the "Do it Yourself" forum. It has incubators, racks, and a bunch of other home made goodies for us. Check it out.

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http://ball-pythons.net/forums/showthread.php?t=73482
DIY cooler incubator


Here ya go. Here's one.

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It's pretty much as simple as taping flexwatt to the bottom of a cooler than taping a probe from a thermostat to the flexwatt. That's all I did and it keeps my 3 egg tubs at 89-90. I used light defusers so the egg tubs werent in direct contact with the flexwatt than jammed water bottles where they would fit.