Kit (with Mount Holder) for US$45.99 (~A$66.69): https://www.tomtop.com/p-y25439.html
Specifications:
Color: Black
Material: PVC
Screen Size: 2.5 Inch LCD Screen
BT Version: BT4.0
Connection Protocol: ANT+
Battery: Built-in 100mAh Lithium Battery
Interface: Type-C
Memory Capacity: 16M
Battery Time: 30-35 Hours
Charging Time: 3.5 Hours
IP Rate: IPX6
Item Size: 69 * 69 * 22mm/ 2.7 * 2.7 * 0.9in
Item Weight: 68g/ 2.4oz
Package Size: 130 * 93 * 50 mm/ 5.1 * 3.7 * 2.0in
Package Weight: 200g/ 7.1oz
The product you linked to is just the mount for <$10 USD.
Click on 'Set A' to see the actual bike computer.