Supola Direct via Amazon offers the Supola Dual Band USB 802.11ac Wireless Adapter with 5dBi Antenna for $20.99. Coupon code "J2B6KTOR" drops that to $10.99. With free shipping for Prime members, that's $10 off and the lowest price we could find. It features up to 1,200Mb/s WiFi speeds on 5.8GHz and 2.4GHz bands. Deal ends February 19.