B&H Photo Video offers the TP-Link AC1200 Dual-Band 802.11ac Wireless Range Extender for $34.99. Clip the 42% off on-page coupon to cut it to $19.99. With free shipping, that's $5 under last month's mention and the lowest price we've seen. (It's the best deal now by $3.) It boosts your wireless coverage up to 10,000 sq. ft. and features two external antennas and a Gigabit Ethernet port.