A small genset is another option. Not having to find ice every other day and deal with the melt, man it's pretty nice. I found an Engel 45 on craigslist. Not the cheapest thing on earth but honestly ... neither are Yeti's. You do have to think through your power strategy though. And that can add more cost (Solar, Dual Battery, etc.). In the end i'm really happy I did it.
