I was recently informed by the Belle and Sebastian listserv that ticket prices for the pit/pavilion will be $45 while lawn seats will be $30. Somewhat pricey, but for all three bands it's definitely worth it. Apparently you can buy tickets at the Merriweather and 9:30 Club box offices starting this Saturday morning and are only subject to a $1 service fee, however, by the time you ultimately make it out to Columbia or DC, I would easily assume that all the decent seats (and the entire orchestra section) would already be snatched up by Ticketmaster Online buyers at 10:03am. If you're going for lawn seats it makes sense, but if you want to be in the amphitheater, it looks like buying tix online might be your only viable option.