It isn't listed on HLJ yet (that I could find), but this should be the Amazon Japan listing for the 2021 Generations book.

It is listed for May 13th, for 3300yen (which is currently about au$80).

Since it is on Amazon Japan, it won't show as being available for people viewing from Australia... and if it doesn't show up on HLJ, we will need a shipping forwarder to buy it from Amazon Japan.