I think the chances of finding it are slim. I lived there and never saw a copy. It's rare even in Japan.
Yahoo auctions are the best bet:
https://page.auctions.yahoo.co.jp/jp/auction/j618885451
The single is there for 10,000 yen.
There is no picture though, so it may be the same as this:
https://page.auctions.yahoo.co.jp/jp/auction/g304926228 which looks like it's a Chinese or Taiwanese re-release.