Use MeritLine coupon code MLCK105NNL1
MeritLine has this Airlink101 802.11n Wireless Mini USB 2.0 Adapter for $14.99. Use the coupon code and the price drops to $9.99. It's compatible with PCs and Intel-based Macs and features a maximum data transfer rate of 300Mbps and WEP, WPA2, and WPA-PSK encryption. Coupon expires after 200 uses. Shipping is free.