London game tickets

Just found out I'm going to happen to be in London when the Saints play on 10/1. I would like to go the game, but everywhere I've seen (that's reputable-ish any) says sold out. It's at Wembley, which would be a cool place to see a game, and it seats 90k. I know there aren't that many fans going or there. Anyone with suggestions on where to find tickets or heard anyone selling them?