TP-Link Foldable USB 3.0 to 10/100/1000 Gigabit Ethernet Network Adapter for $9.99. Here is a screenshot for reference. Shipping is free on orders over $25. If needed, use this Filler Tool to pad the order for free shipping. This is useful for many of the thin-and-light laptops that may be too thin to have a ethernet port built-in.