^ One of the member's here, immel, wrote a guide on how he got tickets to see Ayu:
http://ahsforum.com/forum/showthread.php?t=70001
A common method is waiting until you get to Japan and buying the tickets from resellers there. Or maybe if you know someone who might be going to Japan earlier, they could get it for you if they find one.
I'm going to Japan in April, and while I'm there I could look around for tickets for you if you want.