I got tickets last year with connections. This year I too was shut out by ticketmaster. Nissan is the only show in the area. He's not playing Merriweather and he's only playing Tuesdays, Thursdays, and Saturdays. Must be nice to only work 3 days a week, 6 months out of the year! Merriweather is still around, but I also heard the rumor that it was being shut down. Something about a big "town center" type community. Don't know if it's ever going to happen.
Ebay sucks. As someone already mentioned, scalpers are everywhere. By noon the day the tickets sold out lawn seats ($36 face) were already $125. If you don't have tickets and really want to go, you're going to have to find a friend, get real lucky, or pay $100+ even for lawn seats.
Nissan still sucks to get in and out of. We got there early, had great parking right up near the fence, then spent 2 hours getting out of the lot after the show (I think...) :D