It seemed overly destructive to just delete these comments by other people on The Treasure Chest Enigma that is now re-printed by SlateAndShell and thus no longer out of print, so I have put them here for others to consider putting back.
By Nakayama Noriyuki. Originally distributed by Ishi Press (H2).
Fhayashi: I bought a copy from Yutopian for quite a hefty sum ($55). The book I received was a hard cover book, signed by the author. There was even a little type-written piece of paper with two figure errata. Well worth the money, if they still have any more.
RafaelCaetano: For what is worth, I paid 1800 yen (U$15) for my copy. I found it in a used bookstore specialized in go and shogi, in Tokyo.
RiffRaff: Yutopian has had this book listed for quite some time, though it is still definitely out of print. Various people seem to keep "finding" more copies of this book though, over the years.
Bob McGuigan: Slate and Shell announced recently that they will be publishing a second edition of The Treasure Chest Enigma