Post #512585 by Mr. NoNaMe on Mon, Feb 22, 2010 2:59 PM

How about a 10.00-20 truck inner tube? They are for semi trucks. They could be about 1/4 thick.
$7-$60 if you want it to hold air. Probably close to free at a junk yard.

http://www.greyhoundog.org

[ Edited by: Mr. NoNaMe 2010-02-22 15:01 ]