Costco offers its members the TP-Link 802.11ac Wireless Dual Band Gigabit Router
, model no. Archer C1900, for $109.99
with free shipping
. (Non-members pay $5.50 more.) That's $3 under our September mention, a current low by $18, and the lowest total price we've seen. It features a 1GHz dual-core processor, four Gigabit ports, USB 3.0, simultaneous 2.4GHz and 5GHz frequencies, beamforming technology, and three detachable antennas. Deal ends December 21.