(will change depending on how much pizzas are at time of purchase)
Im from NSW and this worked for me.
Instructions:
Pick 3 pizzas
add code 06206 - removes delivery charge
add code 62195 - 2 pizzas for the price of one
add code 68778 - adds garlic bread and 1.25 L coke at 3 dollars each
when i added these the store said that they were conflicting coupons but it added it anyway, hope this works for you.
If possible, link to www.dominos.com.au (with the Australian prefix rather than the US store).
BTW delivery didn't work for the West Ryde store