I live in the Bay Area and will be at this game too. In the past it's been easy to get niner tickets directly from the box office or aftermarket for a good price. However, they are now good and tickets will be a hotter commodity this season. And although the Bills are not a heated rival, it'll still be a few bucks for the tickets. Your best bet- unless you can get them directly from the Niners when they go on sale to the general public- is to buy through NFL ticket exchange. Second best option, Stubhub. Third Craiglist and/or Ebay. See you there in October; hopefully we can pull off the upset. Either way it'll be a blast.