Harvey Norman have their own pre-order deals on the new Fold/Flip range.
Galaxy Fold - Bonus $400 HN gift card https://www.harveynorman.com.au/samsung-galaxy-z-fold4.html
Galaxy Flip - Bonus $300 HN Gift card https://www.harveynorman.com.au/samsung-galaxy-z-flip4.html
They also have bonus gift cards for
Galaxy Watch 5 - Bonus $100 gift card https://www.harveynorman.com.au/samsung-galaxy-watch-5-bluet…
Galaxy Buds 2 Pro - Bonus $50 gift card https://www.harveynorman.com.au/samsung-galaxy-buds2-pro.htm…
Update: Thanks to Farque for pointing out a great deal if you wanted to sign up to $69 Optus Plan
Flip $399 upfront + $300 HN Gift Card + Optus $69 plan for 24 months https://files.ozbargain.com.au/upload/253051/97562/capture.p…
Fold $1399 upfront + $400 HN Gift card + Optus $69 plan for 24 months https://files.ozbargain.com.au/upload/253051/97563/capture2.…
If they did this at jbhifi would be worth it due to the trade in bonus aswell