Anewish via Amazon offers its Anewish AC600 802.11ac Dual-Band Wireless USB Adapter for $15.99. Coupon code "A3MHD82Z" cuts it to $9.99. Plus, Prime members bag free shipping. (Non-members can get free shipping via Subscribe & Save.) That's $1 below our August mention and $2 under the lowest price we could find for a similar adapter. It features wireless speeds up to 600Mb/s on 5GHz and 2.4GHz bands and a long-range 2dBi detachable antenna.