Newegg offers the Rosewill AC1200UBE Dual 802.11ac Wireless USB 3.0 Adapter, model no. RNX-AC1200UBE, for $22.99. Coupon code "RWMAILBZ" cuts it to $18.39. With free shipping, that's the lowest total price we could find by $12. Features include up to 300MB/s wireless data transfer rates and simultaneous 2.4GHz and 5GHz frequencies. Deal ends November 18.