Mercusys AC1300 High Gain Wireless USB Adapter $12 + Delivery ($0 with Prime / $59 Purchase) @ Amazon AU

Speeds up to 867 Mbps (5 GHz) + 400 Mbps (2.4 GHz)
MU-MIMO
WPA3, provides enhanced protection in personal password safety
Backward compatibility – Full support for 802.11ac/a/b/g/n standards