Thanks to the amazing 12.5% cashback offer from CR and Shopback, this brings RDR2 to about $60.375 for a preorder. Amazing value and I reckon this would be the cheapest any brick and mortar store would offer. At least you get the convenience of shipping on release day to save petrol.
Update 11 Oct: Cashback offers have expired.
Update 20 Oct: Price now $62, from $69.
Black OPs 4 sells for $54.25 after 12.5% shopback/CR cashback (thanks aja12!) - https://www.amazon.com.au/Call-Duty-Black-Ops-PlayStation/dp...
Edit 11-Oct-2018: I made a calculation mistake. I wasn't supposed to include GST. RDR2 would cost $62.73 after cashback.