Last week I bought ensolite sheets here locally (Jacksonville FL) that are clearanced. I paid less than $1.50 per square foot. It is sold in untrimmed sheets and will only be available until it is gone.
Hecht Rubber Corporation, Industrial, Rubber, Products, Engineering, Fabrication, Manufacturing, Jacksonville, Florida
The sheets are .177 mil. thick, and I think the usable dimensions are 40 inches by 42 inches, they must be trimmed
and are black but are paintable. They do ship but not sure about their rates.
William is the one who helped me.
Hope this helps somebody.