Might be worth it for some to get the 9x $20 store credit.
The least expensive item that gets you Gold Services Extra is this globe for $4
https://www.thegoodguys.com.au/connect-smarthome-smart-5w-rg…
3 years Gold Services Extra is $30
and delivery was $3 for me.
EDIT: found a better deal $34 as this has free delivery
https://www.thegoodguys.com.au/crest-novelty-desktop-palm-tr…
You could also try this phone case for $5 if you want to pickup
https://www.thegoodguys.com.au/techxtras-2-in-1-phone-grip-s…
T&Cs on the credit
https://www.thegoodguys.com.au/storecash/storecash-terms-and…
If you are doing this for that promotion whatever, but jeez they trying to make basic warranty stuff and consumer rights a subscription plan.