Webs Best Deals via eBay offers the used Linksys Smart 802.11ac Wireless Dual-Band Router, model no. WRT1900AC, for $118.99 with free shipping. That's $46 below last month's refurb mention and the lowest total price we've seen. (It's a current low by $45 in any condition.) This router is backwards compatible with 802.11ac networks and features a 1.2GHz dual-core processor, speeds of up to 1.3Gbps, four Gigabit Ethernet ports, Gigabit WAN port, USB 3.0 port, and LED status indicators.
Of note, no warranty information is provided.