Ocean Technology via Amazon offers the Unitek USB 2.0 to RJ45 LAN Wired Gigabit Ethernet Network Adapter in Black, model no. Y-1465, for $8.99. Coupon code "74CC93TI" drops that to $3.15. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.) That's $2 below our October mention and the lowest total price we've seen. (It's also $4 under the best deal we could find for a similar adapter elsewhere.) It supports crossover detection, auto-correction, Wake-on-LAN (WOL), and IPv4/IPv6 protocols.