Unlimited Free Deliveries for 30 Days at Countdown.
It looks like the purchase minimum for delivery to activate is $80.
Copied from the t&cs:
5.7 Free Trial
A 30 day free trial is available to all customers without an active delivery saver who have a registered Onecard.
A credit card is required in order to access the free trial.
Upon expiry of the free trial, either a monthly subscription or 6 monthly subscription depending on which subscription you have signed up for, will be charged to the nominated credit card unless the trial has been cancelled by you.
it has been posted before (the deal had been expired even tho it never expired)