Re: It really pays to research what you need
trash, I would just second Minne's thoughts: Make sure it is the SAME material, not just something that sounds similar. Sometimes dealer pricing is a rip-off, but sometimes the deals you find on the web are too good to be true. A big problem with "foam rubber" type products in general is that there's a lot of cheap stuff on the market, that looks identical to the good stuff, and you won't know until five or ten years down the line when it either turns to goo or dust.
Whatever you do, if you use something like ArmorAll on the "rubber" a couple of times a year, you'll find it lasts many many years longer.