Yeah, I've been in Beijing now for about 30 hours and I have yet to find an easy way to buy additional tickets at "good" prices. The locals seem to have their sources (a local colleague was able to score me some US water polo tickets at face value though a "neighborhood association"), but it doesn't seem so easy for foreigners. There are certainly scalpers floating around, but if you want to buy in advance for the premium events, you will pay a substantial premium. As mentioned above, there isn't a logical physical location to trade seats because the Olympic Green is closed to non-ticket holders (and folks seem skittish about the anti-scalping laws). I went up to a subway stop just outside the Green today, and I saw several people holding up signs looking for tickets, but I didn't really see any tickets for sale. In general, the area I saw outside the Green looked dead and very un-festive.

In Atlanta, I was able to buy all the tickets I wanted from the Russian weightlifting team staying at my hotel, but so far all I've run into are tourists. If anyone has a source of affordable tickets, please PM me (or post it here). Thanks. As I already have tickets to 8 events, I'm not so willing to stand on a street corner and "hunt" for them. Also, I need 4 tickets, which can be hard to find on a street corner!