Shipping and delivery to AUS is $15 for standard express which seems reasonable:
https://www.tecobuy.com/en_AU/shipping-and-delivery
Might be international stock based on their FAQs:
https://www.tecobuy.com/en_AU/frequently-asked-questions
"Q. Any reasons why the original charger is not fitted with a local plug?
A: All our products are sourced globally and normally contain different versions for different countries, we will not specially classify from which country or region a product is. But we will include a travel adapter in your parcel to solve this issue."
From the webs, this one supports dual SIM (one being eSIM) - how do you use it?