Happygo Forever via Amazon offers the Ambolove AC600 Dual Band USB 802.11ac Wireless Adapter with 5dBi antenna for $16.99. Coupon code "MCWXPEV2 cuts it to $10.99. With free shipping for Prime members, that's $1 under the lowest price we could find for a similar adapter elsewhere, although we saw it for a buck less on Black Friday. It features up to 600Mb/s WiFi speeds on 5GHz and 2.4GHz bands. Deal ends January 15.