For those building swim platforms or their version of a surf gate that want cheap, 1" HDPE - try calling a local commercial construction contractor that specializes in toilet partitions. Plastic (aka HDPE) toilet partitions are used in many schools and public facilities such as water parks. A good size contractor will probably have at least 1 "whoops" piece of material laying around that you should be able to make a deal on.

If you're wanting to match your boat, HDPE toilet partitions come in quite a few colors.

http://www.accuratepartitions.com/so...finishes-popup

You could even look at ordering a 24"x42" urinal screen to mount to the back of your ride.

Anyone in the ATL that wants some HDPE, just let me know.