Use TigerDirect coupon code COP64024
TigerDirect has this D-Link 802.11n Wireless Pico-Size USB 2.0 Adapter for $19.97. Use the coupon code and the price drops to $4.97. It supports speeds up to 54Mbps, WPA and WPA2 encryption, and Wi-Fi Protected Setup. Walmart
has the same item for $24.99. Shipping is $2.29. Coupon expires after 400 uses.