TP-Link AC5400 Tri Band WiFi Gaming Router(Archer C5400X) – MU-MIMO Wireless Router, 1.8GHz Quad-Core 64-bit CPU, Game First Priority, Link Aggregation, 16GB Storage, Airtime Fairness
$149 on Amazon. Purchased about five years ago. Works great; we just no longer need it.
$75 OBO (I'm not really sure what to price it at)