Amazon offers the TP-Link AC1200 802.11ac Dual-Band WiFi Range Extender for $48.99 with free shipping. That's the lowest price we could find today by $21, although we saw it for $9 less in November. It boosts your wireless coverage up to 10,000 sq. ft. and features three adjustable antennas, a Gigabit Ethernet port, and signal strength indicator.