http://www.kooleraire.com/kooleraire25.htm

It's a replacement top for a common coleman cooler. It uses a 100 cfm
pancake fan to blow over ice in the cooler, and blows out cool air.

Apparently it doesn't have any sophisticated heat exchanger, just blows
air over ice or frozen bottles.

Has anyone tried it? Is there any reason to think that one couldn't
make one with $15 worth of stuff from radio shack?

Thanks,

Jim