If you can be bothered, it is possible to get live access to bike auctions in Japan through various companies.
I have never done this but maybe others have?
Here is one example of such a company: http://www.trade.co.jp
I guess there will be all sorts of costs and hassles associated with such a process, but at least you should be able to find a bike reasonably quickly due to the huge number of bikes up for auction in Japan.
..., Just my 2¢. (sorry, 2 pence, [.. or should that be ¥2]
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[color=#808080][size=9]Yes,.. I too know how to waste Time and Money,...