I wouldn't get the stuff from wally world. plus, iirc those pieces were only 36" wide. If you have a regular (non-LSE) lower bumper, you need a piece almost 39" wide.
I organized a group buy with 3 other members here to offset the price, since you can only buy the true matching piece in a 48"x96" sheet. I took it one step further than the LLSOC guys by specifying the correct way to cut the sheet so the rows run the same way as the mclaren upper grille.
I don't know if you can find other members to do the group buy with you, but I believe the total cost for the sheet, shearing, and shipping was between $250 and $300.
the company that sells the material is ametco.com
Oh, and holy dead thread revival!