T-Mobile offers the used Asus T-Mobile CellSpot Dual-Band 802.11ac Wireless Gigabit Router for $49.99. Coupon code "ROUTER" cuts it to $39.99. With free shipping, that's a tied with our mention of a new one from August and $20 under the price of a new one today. It features wireless data rates up to 1.3Gb/s, dual-band support, and prioritizes WiFi calls.

Note: No warranty information is provided.