They sell great heavy duty plastic ones at the Taxidermy place at the Traffic circle, 28 by pass, in Manchester..not sure the cost but the are rugged. We have used a nice heavy duty tarp in the past, just bunch it up nice-n-tight with rope, it seems to ride on top of the snow better then a sled..but it takes some practice folding and bunching it up so everything stays in. Islanders know EVERYTHING THAT COME TO THE ISLAND WILL EVENTUALLY COME OFF OF THE ISLAND...WOULDN'T LIVE AT THE LAKE ANY OTHER WAY!