I'm at a loss to understand why you're having trouble finding a screen for your phone, even in the Down Under. I've replaced quite a few aftermarket OLED screens on iPhone X's and can't see a difference in quality between them and the original Apple screen. My go-to sites are usually Amazon, eBay and AliExpress. I don't know about Amazon's support for shipping to AU, but a quick check of ebay.com.au brought up several to choose from; here's an example.
[link|https://www.ebay.com.au/itm/134676712724|iPhone X XR XS MAX 11 Pro LCD OLED Screen Replacement Touch Digitizer Display!!|new_window=true]
And one from AliExpress; quite a bit cheaper.
[link|https://www.aliexpress.us/item/1005005721132806.html|OLED Pantalla For iphone 11 11 Pro Display Touch Screen Digitizer Assembly For iPhone 11 Pro 11Promax LCD 3D Touch Replacement - AliExpress|new_window=true]