Ok so Bestbuy have the pixel 3a for $199 USD. Equates to roughly $285 AUD. Even if you add $50 for shipping it is still significantly cheaper then what I have seen locally.
https://www.bestbuy.com/site/google-pixel-3a-with-64gb-memor…
It's 'Activated' to Sprint, but unlocked and it can switch carriers at any time. Or so they say.
Has anyone done this before? Bestbuy state they don't ship to known forwarding services. Can you really just plug in an AU sim and it will all be fine?
Get someone from the USA to buy it for you