mwave offers the HornetTek 802.11n Wireless MIMO USB 2.0 Adapter, model no. HT-H10DN, for $21.49. With free shipping, that's $3 under our October mention and the lowest total price we could find by $6. It features dual high-gain dipole antennas, Cisco-compatible extensions, up to 300Mbps transfer speeds, 64-bit,128-bit WEP, WPA, WPA2 support, and more.