i am an authorized distrubuter for IXOS products. they have a product called quiet zone its the same thing as any others. for less than 1/2 that 40 price for a 4.5 sq foot sheet.
we also have 2 other types of mat. if weight is an issue for you we also carry an upper line mat that is made from thermal plastic that weighs about 1/2 the regular stuff. and another line above that that is aluminum backed.
we also carry the spray so you can apply it into places you cant get to with the mat.

also if you know anything about IXOS products you should know that they are some of the highest quality wire, RCA's, connectors in the industry. better than monster, stinger, ect... only the highend shops use IXOS.