Apparently they've pulled all the "AFC Champions" apparel, but you can still get a t-shirt (below) commemorating their last game from the Jets pro shop.
I am kinda surprised none have ever worked there way back to the US and went on ebay.
Imagine some relief worker sees a kid wearing one. Buys it off the kids for two new shirts and bag of rice.
Comes home posts it on ebay, with a picture of the original owner wearing it some 3rd world slum and the story about how he bought it and what he did on mission and says that all of the money raised will be sent back to donated to buy books for the school in that slum.
While some shirts would fetch more than others I bet the Patriots 19-0 could fetch a couple grand to hang in some NYC sports bar.