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While not as cheap as HN or Video Pro's offers this morning, cashrewards has an additional 6% cashback at binglee for their flash sale (6pm till 12pm tonight), so that would make them slightly cheaper :
55" - $1583.90 https://www.binglee.com.au/products/cs-55-4k-oled-tv-with-se…
65" - $2297.36 https://www.binglee.com.au/products/cs-65-4k-oled-tv-with-se…
77" - $4121.90 https://www.binglee.com.au/products/cs-77-4k-oled-tv-with-se…
Plus a bonus offer of 3 months free apple TV.
(I haven't factored in the prices of the potential for CB to not apply to the GST component)
Cheaper at The Good Guys Ebay IF you don't want to deal with cashbacks.
https://www.ozbargain.com.au/node/747393
Edit. and have eBay Plus.