The deal should be there for a while. The console has already been released at the end of last month in Japan.
It seems Nintendo Switch console in Japan is always cheaper than in AU.
The console (the Zelda game is not included) costs ¥38,980 (~$430) + Amazon International Delivery ¥2085 (~$23) ~$453 delivered, which is about $100 cheaper than AU version. The shipment takes about 10 days.
It should come with a global 100-240v adapter (US type socket) according to a reddit post. Use a travel adapter easily fixes the issue. The console is also region free.
The adapter is 100-240V wide voltage. Also there might be a warranty problem for imported models.
It's unlikely these game-themed models are limited, so you should be able to wait for further discounts in the future, if not in a hurry.
It also doesn't come with the game just in case you don't know.