The following is a Linksys E2500 V4 which has been flashed with OpenWRT version 25.12.5 (if you don't know what OpenWRT is, I would recommend doing some research on it before buying this).
The listing includes the router and power adapter as shown.
Note: the WAN port appears to be limited to 100Mbps, so be aware that this could be a bottleneck if your internet speeds are higher than this and you want to use this as your primary router.
Also note: the keen-eyed among you may know that the E2500 V4 is normally a WiFi 4/802.11n router, but I am calling it a WiFi 5 router. This is no mistake: The E2500 V4 is actually identical hardware internally and even the same FCC ID as the WiFi 5 E5400 model, so when flashed with OpenWRT, it unlocks the full capabilities of the WiFi 5 hardware inside.
Specs:CPU: MediaTek MT7628AN (single core, 580MHz)RAM: 64MBStorage: 16MBWireless MIMO: 5GHz 802.11ac2x2, 2.4GHz 802.11n2x2LAN Ports: 4x 100Mbps portsUSB ports: none