I've been doing some research around a new smartwatch/fitness tracker, and I found this on eBay AU. It's from UK, free delivery to Australia. They mention a 12-month warranty that is probably UK-based.
Seller with good reviews.
For reference:
https://buy.garmin.com/en-AU/AU/p/643399/pn/010-02172-02
EDIT:
As others mentioned, this is a newly overhauled (NOH) device (aka refurbished).
"This is a Garmin Newly Overhauled device"
A newly overhauled (NOH) device is a device that was returned to Garmin to be factory refurbished.
https://support.garmin.com/en-AU/?faq=YwZb6iyvff8q3W6oSQZt0A#:~:text=A%20newly%20overhauled%20(NOH)%20device%20is%20a%20device%20that%20was,%2C%20maintaining%20high%2Dquality%20standards.