Refer-a-Friend: A$30 for Referrer, A$20 for Referee (after Referee Spends Minimum A$20 within 14 Days) @ Cashrewards

if a new member joins before 11:59 pm AEDT on 29 January 2023 and make a qualifying purchase of $20 or more within 14 days of signing up, you will get $20 into Cashrewards account.

The is more than the usual $10 join up bonus via referral.

note you have to make sure you use an updated referral code clearly stating $20 or else you may only get $10.

(the referrer has to update the referral code for the new promotion).

Some suggested shops for everyday items (some with free delivery with conditions.

Amazon Australia on selected products.

Aliexpress.

4.5% cashback
needs to check items for eligible first as per link
https://portals.aliexpress.com/linkchecker.htm

eBay Gift Card

Unfortunately, countdown NZ does not have an active cash back offer but could wait for few days after rejoining to see if they become available again.

once you have joined the cashback website also offers targeted $A5 cash back offer from time to time, for $A5 spent. so if you usually buy or plans to buy from those Aussie sites it is worth joining.