Nippon Export is all sold out of Ayu t-shirts at the moment.
If something like this:
http://ecweb1.avexnet.or.jp/sapc/pro...?PCD=ANHA-0052
is what you're looking for, you can go through a deputy shopper like Masamichi at Crescent Shop (
www.crescent-shop.com , I think) and have him order one for you. There are other Team Message T-shirts under Ayu's category at avex's shopping site, mu-mo. Click here to browse through the products:
http://ecweb1.avexnet.or.jp/sapc/CatList.aspx?CAT=HAMAS
Masamichi and his staff are great, they're really fast and very helpful. Just make sure you have a Paypal account so you can pay them a little deposit before buying the item for you. They'll charge you only a small commission, the price of the item, and then whatever it costs to ship it to you.
Good luck!