Newegg offers the Buffalo AirStation AC1200 802.11ac WiFi Dual Band Router, model no. WHR-1166D, for $54.99. Coupon code "EMCWHWC27" cuts it to $34.99. With free shipping, that's the lowest total price we could find by $5. This dual band router features support for 2.4GHz and 5GHz bands, four 10/100 Ethernet ports, and one Gigabit WAN port. Deal ends December 18.
Update: Specs corrected.