Newegg offers the refurbished Asus AC2400 4x4 Dual-Band 802.11ac Wireless Gigabit Router, model no. RT-AC87R, for $144.99 with free shipping. That's $3 below our refurb mention from last August and the lowest total price we've seen. (It's also $105 less than you'd pay for a new one today.) It features a 2.4Gb/s maximum data rate, USB 3.0, Trend Micro AiProtection, AiCloud 2.0, and four adjustable antennae. Deal ends February 15.
A 90-day warranty applies, although it's unclear who backs it.