Well, er. The only way to get the headphones was to mail a special coupon to GanGan magazine waaaay back in May.

However! I *have* seen the headphones occassionally show up on Yahoo Japan auctions. So if you really want them, you can use a proxy service like Celga or something to snag them from Yahoo Japan. I know that the headphones have been spotted in Liberty and Mandarake stores in Japan, too. So just keep watching those auction sites, they're bound to show up eventually. You might have to pay an arm and a leg for them, though.