If you were looking for an asphalt faced product this might work. You would still need to find some company that would sell or give away some scraps.

http://www.specjm.com/files/pdf/VentsulationFeltRS2020.pdf

If you were looking just for felt, companies like these might sell it in the quantity that you were looking for.

http://www.thefeltpeople.com/?gclid=CJurk-SR3ZsCFRYiagod1z7rAA

http://aetnafelt.thomasnet.com/view...wool-and-wool-blend-felts?&forward=1

"Nothing astonishes men so much as common sense and plain dealing." - Ralph Waldo Emerson