I picked up a very little refrigeration unit that plugs into 12 volts partly to keep things kool on trip but also with the thought of putting in a proper temperature controller so I could actually set it. It goes right on down to about 2 deg C but has no regulator to set it in between. 'someday' I hope to put in a regulator (home brew) so I can set it and put a camera in it. The unit could hold my Canon 40D or this CCD unit easily OR a six-pack
Why go to all that trouble? Well the wife factor is one very good reason. I am a bit forgetful and just KNOW I would leave the fridge at say 15 deg C and once this is discovered. Well lets just say there would not be 'a good reaction' from my generally wonderful wife