Akodi via Amazon offers the Anewkodi AC600 Dual-Band 802.11ac Wireless USB Adapter for $17.99. Coupon code "NHCMN4FB" cuts that to $9.99. Plus, Prime members receive free shipping. That's $1 under our mention from March and the lowest price we've seen. (It's also a buck under the bets deal we could find for a similar adapter.) It features a long-range 2dBi antenna and up to 600Mb/s WiFi speeds on 5GHz and 2.4GHz bands. Deal ends August 14.