If codes in post don't work, please check comments for alternative codes
Spot checked Sydney stores randomly and found Bella Vista, Epping, Turramurra, Parramatta (Church St), Riverwood, Penrith, Campbelltown and Marsden Park to all work.
Price slice today only, value pizza for $4 and traditional for $6 seems to be the highlights here, probably different codes for different regions so check your emails.
Garlic bread $2 Codes: 512531 / 265537
Value $4 Codes: 228995 / 730039
Traditional $6 Codes: 197950 / 909689
Premium $8 Codes: 747768 / 257490
Thanks doweyy for second set of codes