Here's another place for foam, in Burbank, CA:
http://www.foammart.com/specialfx9.html
And this is American Science and Surplus. When I lived in Chicago, I would go to the store and just wander up and down the aisles, always finding something I could use (gasket rubber, foam balls, fishing floats, weird but cool stuff that I still haven't figured out what to do with yet).
http://www.sciplus.com/
http://www.foammart.com/specialfx9.html
And this is American Science and Surplus. When I lived in Chicago, I would go to the store and just wander up and down the aisles, always finding something I could use (gasket rubber, foam balls, fishing floats, weird but cool stuff that I still haven't figured out what to do with yet).
http://www.sciplus.com/