We’re not sure how it’s even possible but Big W seems to have Launch Day PS5 stock for pre-order. It’s been going in and out of the stock for the last few hours, so best to keep your eyes on this link.
For the rest of the games and accessories that you need to pre-order, Amazon has you sorted.
https://press-start.com.au/news/playstation/2020/09/17/where-to-preorder-ps5-australia/