I bet for the price of the Yeti you could probably get a 12 volt chiller/frig. I've seen some in ice chest size. I wouldn't put fish in it though cause it'd be hell to clean. Just vital medicine and survival gear ...in other words: beer.
On second thought, maybe not - Here's a 39 quart. It lists for about $800. I wouldn't have any beer money left over...
http://www.sailorsams.com/images/cf-40.jpg