Newegg offers the TRENDnet AC750 Dual-Band 802.11ac Wireless Router, model no. TEW-810DR, for $47.99. Coupon code "EMCWHWD82" cuts it to $23.99. With free shipping, that's tied with our September mention as the lowest total price we've seen. (It's a current low by $22.) It features a maximum speed of 733Mbps (433 Mbps AC + 300 Mbps N), dual-band support, and four Ethernet ports. Coupon expires December 22.
Update: Specs corrected