well, if you don't like ebay, you probably won't like this..
but
http://auctions.yahoo.co.jp has tons of Ayu and Ayupan stuff.
Problem is it's in Japanese and most people don't ship overseas anyhow.
BUT you can proxy bid using
www.celga.com . They have people in Japan who will bid on the item for you and receive the merchandise inside the country and then ship it to you.
You have to pay for: the items you bid on, the shipping inside japan, the bank transfer fee, a fee from celga, and shipping overseas.
Depending on what you bid on, it could be a great deal or a bad deal. But, they will hold items for you so you can ship things internationally all at once instead of shippng every item as it comes, which can be quite expensive.
Anywho, check out the site if you're interested. I just used celga to bid on some MTRLG shirts, so I'm familar with the process if you have any questions.
Ashley