Yeah, so, O.K. here it is.
I made this can cooler in my spare time (over the course of about a year), because I saw one of these cylindrical heat sinks in a computer workshop and thought it looked like a cylinder on a radial aircraft engine. So, I kept an eye out for them a various computer swap meets. When I found four heat sinks, I made this cooler. The base is made out of scrap aluminum. I cut it down, as best I could, and asked a friend to bore out the opening for my pop can. I drilled and tapped the holes to hold the sinks in place and the compression holds the junctions in place. I used four surplus peltier junctions, which I found on Froogle.com.
It took a while to build because I wasn't going to spend tons of bucks on the project. I spent about twenty bucks on it... not counting the stainless steel solar panel I mounted on a tower outside. Actually, I already had the panel and needed a use for it.
The cooler is substantially under-powered; as it is only supplied with less than 30 watts to all four peltier junctions. But, if the sun is up, the cooler is cool.
parts:
Hunk of aluminum, free
4 neat heat sinks, $4.00
5 pack of used peltier junctions, $15.00
cold pop, $ priceless