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Dominos have got creative with their paid search activity. If you want 30% off your Dominos order simply search for Pizza Hut on google and the you will be served a 30% off Dominos ad in P1
Not sure if the promo code attached is correct but its the one I was served - It might change each time
Note that for most stores/cases (especially with traditional pizzas), it works out cheaper to use a $7.95 traditional / $10.90 premium pizza code than the daily 30% off codes. There are $7.95 codes on the OzBargain Pizza Page or you can try the Domino's offers app and set your local store if no luck.