Today only (or until 100% claimed), Amazon offers the TP-Link AC1200 802.11ac Wireless Dual-Band Ethernet Router, model no. Archer C1200, for $6.75 with free shipping. That's $44 under our December mention and the cheapest 802.11ac WiFi router we've seen. (It's the best deal today by $58.) It features four Ethernet ports, USB, simultaneous 2.4GHz and 5GHz frequencies, and three external antennas.