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.