You could make one from a plastic tarp in the yard, or a practice trip. See if you like that size (or just the idea of a tarp) before throwing down the green stuff. Cuben ain't cheap. I would make sure it is what I wanted before buying. In fact, I would probably make/buy a polyurethane coated one and use it a year before I bought the cuben one. I am not saying you will regret the cuben purchase.