It's called McMaster Carr. www.mcmastercarr.com Lots of good stuff here.Good prices too.
They sell rubber by the sheet. I want to make a set of knee pads for my tank.I would like to get a piece of rubber that would be stiff enough that I could carve with a router but flexible enough to bend to the contours of my tank. Anyone have any insight on which type of rubber that would require? There are a bunch of different compositions,but I'm not up on my rubber compositions
http://www.mcmaster.com/#standard-rubber-sheets/=h629c4