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It's tucked away, but an easy drive to our from the airport. There's a variety of books, and it's always good to check for gems. This author, A A Attanasio, used to love in the Big Island. I've hard a hard time finding anything of his older works. I still look, but was happily surprised to find some books from his Arthurian adaption in the '00s.
Hilo has a lot of used book stores, so always check in when you can.