Anewish via Amazon offers its Anewish AC1200 802.11ac Dual-Band Wireless USB Adapter for $21.99. Coupon code "A9NNKV4W" cuts the price to $11.45. With free shipping for Prime members, that's $11 off and the lowest price we could find. It features wireless speeds up to 1,200Mb/s on 5GHz and 2.4GHz bands and a 5dBi detachable antenna.