Greetings,
Although the acquisition cost is pretty high, I found my 12v Freezer to be very handy on the road. I'm pretty sure that I spent a little over $300 for it, and it has a 14 quart capacity. In hindsight I probably would have gotten a larger one to stretch the time in between grocery runs, but as such I could fit a lot of hot pockets and frozen dinners in there if I took them out of their boxes.
I bought it from a web site called compactappliance.com - where they only seem to sell big ones now. Even so, if you're in it for the long haul its a good way to save $$$!
Here's a picture of mine:
http://www.compactappliance.com/imag.../ENG15_vl1.jpg
- Nathan