Get from Amazon.com : http://www.amazon.com/gp/product/B000FOWHTI?tag=hawaiianlegac-20

Belkin F5D5055 Gigabit USB 2.0 Network Adapter

Easily upgrade your notebook or desktop computer to full gigabit speeds
Provides networking speeds of up to 1000 Mbps
Offers easy integration into existing 10100 Ethernet networks
Features extensive driver support and works with Macintosh computers
Limited Lifetime Warranty