Third-Party
Rydges South Park Hotel (Adelaide) restaurant Skyline has a Hotdocket offer.
Purchase 1 main meal and receive another free (up to equal or lesser value)
Seems pretty good. From looking at their menu:
-300gm M.S.A scotch fillet steak served with double baked potato rosti and red wine jus $32
So works out to be $16 each for the steak, if you both got the same steak. From what I remember, even Cafe Primo charges ~$25 for a steak.