Autley Direct via Amazon offers its Autley AW600 Dual-Band 802.11ac Wireless USB Adapter for $18.49. Coupon code "JXHBOLB4" cuts it to $10.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.06.) That's tied with our mention of a similar item from two weeks ago and $1 under the lowest total price we could find elsewhere. It features a long-range 2dBi antenna and up to 600Mb/s WiFi speeds on 5GHz and 2.4GHz bands.