The best place to look is on ebay motors under amphibious or 6 wheeler. There is also a 4X4 called little critter that is water tight. I have a swamp fox 6X6 now which is about a 1985 model. goes through about anything and is floats. The newer models are either MAX or ARGO. If I was to buy a new one or a newer used one I would purchase a ARGO. I have seen both in action and I am more impressed with the ARGO. A good website to look is RT 6X6. If you buy a used one make sure to test drive and float before you buy, a lot say water tight and are not, mine leaks a little water around the axle bearing but the beige pumps takes care of it. They are a lot of fun and can go anywhere. I have been tossing around the thought of selling mine, I live in the city and can get in too much trouble.