Edimax EW-7811Un 150Mbps 11n Wi-Fi USB Adapter, Nano Size Lets You Plug it and Forget it, Ideal for Raspberry Pi / Pi2, Supports Windows, Mac OS, Linux (Black/Gold) - Walmart.com
Amazon.com: Edimax EW-7722UTn 300 Mbps Wireless 11n Mini-Sized USB Adapter with EZmax Setup Wizard White : Electronics