Byahhh! *Howard Dean yell*
I found him at Wal-Mart! He was the only one they had. It didn't look like they had just restocked or anything either, it was weird.
When Caped Crusader told me Alley Viper was the current rarest G.I. Joe, I kicked myself, because I actually saw him at Target about a month before CC told me that, and didn't realize. Today at Wal-Mart was only the second time I've seen him, and this time he didn't escape!
He's an awesome figure! This one is going on the wall for sure.