how stiff is the open cell? (less dense or more dense than couch cushion foam) and how much does 12 dollars buy? (??ft. wide by ??ft. Long, by ??inches thick?)
if it was high quality open cell (much denser than couch foam) I'd pay 12 bucks for a decent sized sheet (4+ft by 4+ft by 1+inches thick) You can use your own judgement, or give me a call @ eight 16-nine 29-five 697.