Getting into Penny Arcade Expo's flagship show in Seattle, on Labor Day weekend, is notoriously difficult if you trek up there without a pass. The three-day variety for PAX 2011 is now officially sold out, according to the expo's official Twitter feed. They've been processing some refunds, freeing up stock incrementally, so there's an off chance passes still are available. But if you waited until now to get your money down, you're probably SOL. [Official_PAX Twitter]