Here's a page from the Anime Cels World dealer's personal 
collection (though none are for sale):
http://www.geocities.co.jp/AnimeComic-Cell/6599/sub101.htm

An auction of the trio repro has been circulating on Yahoo!Japan 
for quite a while:
http://page2.auctions.yahoo.co.jp/jp/auction/b43628588

Good luck on your search!