I actually have seen LRG at marshalls before. You'd be pretty surprised at what you can find at these stores. If you are really lucky you can find nice quality jeans for dirt cheap.
I rmember seeing lrg in tj maxxx around 4 years ago, it was a couple pairs of jeans...but I havent seen any since they blew up...even now I dont see any lrg in tj maxx or marshalls...
...and yeah the polo shit in stores like tj maxx etc are defects or made specifically for the outlets and discount stores...so they are cheaper quality than dept store versions...