B&H Photo Video offers the TP-Link AC1200 802.11ac Dual-Band WiFi Range Extender for $39.99. Clip the 17% off coupon on the product page to cut that to $32.99. With free shipping, that's tied with our September mention as the lowest price we've seen. (It's the best deal today by $7.) It boosts your wireless coverage up to 10,000 sq. ft. and features two external antennas and a Gigabit Ethernet port.