Rosewill Wireless-N 802.11b/g/n USB 2.0 Adapter for $19.99 shipped after applying coupon code EMCLNLP64 to get free shipping. This USB 2.0 dongle supports 802.11b/g/n protocols and WEP/WPA/WPA2, and more. It also works with Windows 2000, XP, Vista 32-bit and 64-bit as well as Mac OS.