Newegg offers the refurbished D-Link AC Smartbeam 802.11ac Wireless Gigabit Router, model no. DIR-868L, for $45 with free shipping. That's $5 below last month's mention and the lowest total price we've seen. (It's also $55 under the best price we could find for a new one.) It features 2.4GHz and 5GHz frequencies, four Gigabit Ethernet ports, and WPA2 encryption.

Note: A 90-day warranty applies, although it's unclear who backs it.