DW,
Getting back on subject, we use one of the Combicool 40L, fridges. It's 3way, 12V, 240V and propane. works very well indeed.
However, if the thing is full, it's useful to move the contents around occassionaly, to prevent the stuff near the element freezing solid.
We use it to preserve the perishables mostly, and chill the odd bottle of Stoli !
I paid 3130 for a new one. I see a once used one went for £87 on ebay earlier this week. In the summer, the used ones seem to fetch very close to new money.
As stated earlier, if you have the room, a 3 way unit from a 'van is a much cheaper option. I recall they were selling for about £40-£50 last year for used ones.