Ocean Technology via Amazon offers Prime members the Unitek USB 3.0 Gigabit Ethernet Converter with 3-Port Charging Hub for $21.99. Coupon code "I43XDZI9" drops it to $8.80. Plus, Prime members bag free shipping. That's $2 under last month's mention, $25 off list, and the lowest price we've seen. It features a Thunderbolt 3 adapter.