Newegg offers the Rosewill 802.11n Wireless USB 2.0 Adapter, model no. RNX-N150UBE, for $9.99 with free shipping. (Amazon offers it for the same price, although stock is limited.) That's tied with our February mention, which also included a USB cradle, and the lowest total price we could find by $4. Features include data transfer rates of up to 150Mbps, WPA/WPA2 encryption, and support for Windows, Mac, and Linux.