Honestly, I'd keep an eye on stubhub. I'm not terribly picky about where I sit, but I see tickets on there for well below face value for Bills games all the time. I had front row, tunnel side for preseason games for $9. For regular season, I see stuff in the $20 range pretty often, especially as the season goes on and people start getting disgruntled (or just don't want to go to the foul weather games).