For panther chameleons, here is my best fancy incubator:
Seriously this is it. For panther chameleons if you can find a dark cabinet in your home that stays about 70-80 degrees, it is all you need and better than a constant temp incubator. This incubator is the cabinet under a sink in a bathroom. Those are veiled chameleon eggs in there at the moment. Humidity is regulated by using properly moistened substrate and keeping the lids sealed other than a very occasional egg check. I do mean very occasional too- some containers will not be opened at all for the duration if there are no obvious problems with the eggs inside. Perfect every time for me and perfect throughout incubation.
I also have some havobators and a variety of home-made forced air incubators for other lizards. My best is huge 5 day cooler that I modified with a heating element ripped out of a havobator, a computer case fan and a herpstat pro incubator thermostat controller (made by spyder robotics- I highly recommend). It keeps the entire incubator a nice constant temperature- no where in the incubator is the temperature more than 1/10 of a degree higher or 1/10 of a degree lower than the target temperature even when fully loaded, and there is room for about 50 sandwich containers of eggs. I can hook it up to a server I made from computer parts I pulled out of the local computer shop's trash (with their permission they have a junk pile of free stuff that consists of good but very dated parts, but year 2000 era parts on my server so slow to boot but works great for this simple purpose)and check my temperatures on the internet any time, and if temps malfunction the herpstat pro has an audible alarm and can call me on the phone and tell me something is wrong. It is overkill for panther chameleons which do best at room temperature incubation anyway.