$2 cheaper than the $49 deals at Big W/JB Hifi at the moment, and with free delivery too. Pity there doesn't seem to be any new generation specific optimisations for PS5/Xbox Series X beyond the automatic quality boosts (yet to be tested) from backwards compatibility.
PS4 link: https://www.amazon.com.au/dp/B08B8LW8SV
Why so cheap? i.e. less than regular new games