|Joined: ||Sat Sep 8th, 2007|
|Location: ||California USA|
|Assuming this is the one you are looking for, there was at least one later (1990) edition that's a bit easier to find, although still long out of print. (I was lucky enough to find one a few months ago.)
There are a couple of them on Amazon Japan here. But I must say that my experience with trying to order from Amazon Japan Marketplace sellers has been frustrating, in that almost all that I've tried to buy from end up not being willing to ship internationally. These specific sellers do look like actual bookstores, so maybe one of them will.
If not, you might try asking Chialing of baby_dream fame if she has one or can get one.