Check your Commbank Yello for your unique code, some will get $15 off $70.
You should be able to get your first 3 delivers free on top of this deal. So also try the Origin code (origin15) which gets you $15 off $65.
Prices are slightly inflated but I've found the net discount is still higher than shopping instore. Add to the the convenience of sitting at home, it's worth it imo.
I found out some prices were higher than instore. Also some in store were half price but milk run only 25% off.
However the delivery speed was super fast. From placing the order to receive the order only 10mins in my last experience.