Ocean Technology via Amazon offers the Unitek 3-Port USB 3.0 Hub with RJ45 Gigabit Ethernet Adapter, model no. Y-3045C, for $19.99. Coupon code "OLXPVZ6G" cuts it to $11.99. Plus, Prime members grab free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.99.) That's $16 off list and the lowest total price we could find. It features a RTL8153 chipset, data transfer speeds up to 5Gbp/s, and 10/100/1000Mbps network speeds.