Ask someone who can read Japanese to help you search this website for the addresses of various fishshops in various areas in Japan.
I managed to get ADA Nature Aquarium Book 2008 F.O.C. at the pet shop in Tokyu Hands at Osaka Shinsaibashi area. The book is a Japanese/English bilingual catalogue with the recommended retail price (in Yen) published therein for all the products (many shops should be selling their products based on these prices I think).
Namba Parks at Osaka Namba area has a fish shop too on the the 4th storey (I think). Both these fish shops are the only two fish shops I visited in Osaka and they carry some ADA products but not the full range.
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