Ocean Technology via Amazon offers the Unitek USB 3.0 to Gigabit Ethernet Adapter
for $12.99. Coupon code "LIUSBE59" cuts it to $10
. Plus, Prime members bag free shipping
. That's $15 off list and the lowest price we could find, although we saw it for $4 less in March. It features data transfer speeds up to 5Gb/s. Deal ends October 31.