Powering electronics with a low-cost thermoelectric generator?
Here's a development kit that looks interesting.  It includes everything needed to conduct thermoelectric generation experiments.

http://www.customthermoelectric.com/powergen.html

It's a little on the pricey side, so I'm going to keep looking for other options.  I wonder if I can just get the thermoelectric generator and pair it with a boost regulator to get a more useful voltage.

EDIT -- even the thermoelectric generator alone is way too pricey.  I think I need to reword my question.