I recently purchased a 4X8 sheet of floor underlayment. It is 3 ply, 3/16", clean on both sides for $11. I put it next to my BB from Woodcraft and see no difference. I know underlayment is often demonized but HD is 10 minutes away. In addition they cut it to 2X4' at no charge. There is a Paxton in Denver but it is 30 minutes away in traffic.