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.
I'm pretty sure I know who is down voting all of these comments here so have a +1.
I'm not going to buy the totk version but if I was I would also buy local, just got the warranty really.