I have a couple of poly tarps that REI used to sell that are the lightest poly tarps I've ever been able to find, but I can't seem to find them anymore. The 9'x12' size weighs about 1 lb. 6 oz., and the UPC code is 7 40816 00003 9.

Does anybody know where I can get something similar? These tarps are at least half the weight of anything else I've found, and are quite strong for their weight. I've got two 9'x12' tarps left, and one 8'x10' that I use regularly, but I really want to be able to get more. I just can't see spending 100 USD on a sil-nylon tarp.