Hi, I speak Japanese so I started poking around and there seems to be a couple places where these can be ordered, but in true Japanese fashion the websites are not mainstream nor are they user friendly. Here is one,
http://www.himorogian.jp/shop/index.htm
The deck costs 3240¥ and you actually have to mail or email in a form. I will talk to my wife and see if I can get a deck sent to her family home in Japan. My father in law farms out in central Japan and he might want a deck, too.
