Newegg offers the refurbished D-Link AC1200 Dual-Band 802.11ac Wireless Gigabit Ethernet Router, model no. DIR-850L, for $27.99 with free shipping. That's $2 under our September refurb mention and the lowest total price we've seen. (It's also $42 below the best price we could find for a new one.) The dual-band (2.4GHz and 5GHz) wireless router features wireless speeds of up to 1,200Mbps and four Gigabit Ethernet ports.
A 90-day warranty applies, although it's unclear who backs it.