I got it from Camping World for $36 for a 4' x 6' roll, comes with spray adhesive and foil tape for edges and seams. It took 2 rolls for my hood. I just ordered 2 more rolls, one for the floor above the trannie and one for the generator bay. I was really amazed at how much quieter it was in the cab.
2003 28' Show Hauler Motorhome on a 1995 FL 120
www.showhauler.com