Holy cow they're expensive (considering what they are).
We're renting a lake house for a week this summer and was considering getting one to add to the things we can do. But no way I'm paying $400+ for a giant roll of foam rubber. Does anyone have a cheaper alternative or alternative ideas?
It'd be cool to have one on the boat too for regular outings, but they look like they'd take up quite a bit of space when not in use.