I have a 10 x 12 x 7 1/2' grow room with like a shit load of fans, and a/c running, it sounds like a wind tunnel outside the growroom door. So I want to add some sound proofing to the walls and door. Can anyone recommend a affordable type to use? And where to get it? Everything i've seen is really expensive like $100 for a 4x8 sheet, and I would need like 10. Has anyone dealt with this before?