Meritline offers the Airlink USB 3.0 to Gigabit Ethernet 10/100/1000 Adapter, model no. AGE-1000, for $24.99. Coupon code "MLCD05EN" drops it to $17.99. With free shipping, that's $2 under the lowest total price we could find for such an item sold elsewhere. It features data rates of 10/100/1000 Mbps and is compatible with Windows and Mac. Coupon expires after 200 uses.