I have two 3-day passes that I can't use as I have to leave town that weekend.
$150 total (for both together), and I'm pretty flexible about meet-up and exchange. I should also mention that I have paypal, so credit card is fine. And I can mail the passes to you.
Line-up and other info can be found on their site: Bumbershoot.
Email me at hoguek (at) u.washington.edu if you're interested.