I should have held my tongue.
I bought $300 worth of closed cell EVA foam (same as EVAZOTE....ethylene vinyl acetate) about 20 years ago for making boat seat cushions.
I dropped out of commercial boat building soon there after, and now have a lot of 2lbs per cubic foot foam. I bought it from a wholesale only outfit in Seattle, named Industrial Rubber.
I recently found a retail supply for 1.8lbs per cubic foot (EVAZOTE is 4lbs per foot...but what I got was half the weight) and thought: "now I can talk about this stuff, because now it's available to everybody!"
Except now I can't find it. I'll poke around. I'll post a retail source as soon as I find it. I still have a lifetime supply. Which is perhaps why I was so careless with that link. I'll find it again.
The following link has 1.7lbs per cubic foot polyethylene foam (used for making life jackets). But the minimum piece is big and 40 bucks.
I'll keep looking
http://www.marinefoam.com/polyethyle...ink_type=image