EDIMAX - Wireless Adapters - N150 - 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
Best Buy: D-Link Wireless 150 Wireless-N USB Adapter DWA-125
Amazon.com: D-Link USB WiFi Adapter Dual Band AC1300 Wireless Internet for Desktop PC Laptop Gaming MU-MIMO Windows Mac Linux Supported (DWA-181-US) : Electronics