heres some shit that works with every major pizza spot (dominos, pizza hut, papa johns, litle ceasars)
every time you get a delivery just say you have a buy 1 get 1 free cupon , from corporate because they messed up a previous order. even if on the SLIM chance the driver remembers to ask, take like 5 minutes "looking for it" - by then he will have called the manager who is just going to let you have it as opposed to re-ringing it up remotely,
i do this all the time. its worked without fail for the pas 15 years