I'm going to be in seattle with a friend for the Dec 23rd Seahawks game vs. the 49ers.

Looking at tickets on Stubhub it appears that this game will be a very expensive ticket!
Does anyone have any experience dealing with the scalpers at the Stadium?

I'm trying to decide if I should bite the bullet and buy the tickets in advance through stubhub or ticket exchange, or if I'll be able to find a decent deal on game day?