Wal-Mart as a source of poly?

I was at Wal-Mart the other day and saw some plastic sheeting made by
poly-america.                      (www.poly-america-dot-com) Well, It said
"linear tough" on the bag and had no recycling icon. From this I assumed I
may be new. I invested $8 for 250sq. feet of 6 mil thick poly and am
"testing" it now. It seems to hold well against High Voltage. Any comments?
This has the "sounds to good to be true" ring to it after all.