I made my own just a few weeks ago. I got a peice of white foam insulation board from Home Depot, it was already cut to 4' x 2'x1" (you could get a big 4' x 8' if you want bigger) then I used plain white flannel and spray adheasive and covered the top and sides of the board. Then used double sided carpet tape to stick it to the wall. Works great and very inexpensive. I think the board was 1.99, flannel 2.99 and tape was 2.97. I had spray adheasive at home.