As is typical of these type of offers, the first pizza has to be purchased at the regular menu price and the free pizza must be of equal or lesser value to the first.
For reference, here's a list of regular menu prices from my local Domino's (price may vary):
- A Medium, 1-Topping Handmade Pan Pizza is regularly $10.99.
- A Large, 1-Topping Hand-Tossed or Brooklyn Pizza is regularly $11.99.
- A Large American Legends or Feast Pizza is regularly $17.99.
Photo via Domino's.