Asus TUF Gaming AX4200 Wi-Fi 6 Router $279 + Delivery ($0 C&C) @ EB Games (Online Only)

WiFi 6 (802.11AX) on 2.4GHz and 5GHz bands
AX4200
4 x 1Gbps LAN ports
1 x 2.5Gbps WAN ports (one may be reassigned to LAN)
USB 3.2 port (file server, print server)
Supports OpenWRT
512MB memory & 256MB flash storage (reasonably good for adding extra features in OpenWRT)

Pretty sure it’s cheapest for awhile