I think the quickest auction is to pick it up from Yahoo Japan Auctions. There's one copy up for sale now:
http://page8.auctions.yahoo.co.jp/jp/auction/h53905511
You'll need to use a middleman service like
Shopping Mall Japan, unless you live in Japan. Of course, it looks fairly pricey at 10k Yen, but I think that it might be preferable to waiting for someone on STC or here to sell it at some unknown price.