For people aiming at buying tickets from a Japanese auction page, such as yahoo auctions, I just got to know about two other pages that you can use.
http://celga.com. A page like akibado, but according to someone I know this place seems a lot more effective, with very nice staff and quick replies to email.
http://rinkya.com. Another page which I know that people have been using with satisfaction, I heard they are a little more expensive than celga.com but they are also a bigger service.