I recently wanted to get some Japanese study materials that weren't from Amazon.
Found Tabi books, prices were reasonable. $50+ for free post within Oz.
Loved the bookmarks they included.
Currently there is a 5% discount until the end of May.
Australia
Orders over $50 AUD qualify for free standard shipping to any address in Australia. Orders under $50 AUD are charged a flat rate of $7.95.
Orders are dispatched from Sydney within 1 to 2 business days. Standard delivery takes 2 to 7 business days depending on destination.


They are mostly Genki / JLPT books which do exist on Amazon. Are you associated with this store, by any chance? If you are, you are required to declare association. See Who is Associated.