There is an American company that seems to have several of those books in stock. AbeBooks | Shop for Books, Art & Collectibles I'm not sure if they are in Japanese or not though. Hopefully you will get some more answers if you give it a while.
Shop from one of our US-based bookstores for manga, comics, books, stationery, and gifts! Many of our products are provided in English, Japanese, or Chinese! *Chinese books mostly available online and in Kinokuniya Seattle.
Kinokuniya. USA. Japanese-based retailer known for its collection of books and magazines, along with gifts and stationery. English Books. Japanese Books. Chinese Books. Events. Featured Books. Stationery.
usa.kinokuniya.com
They have locations in the US or you can order online.