mwave offers the PremierTek 802.11n Wireless USB Adapter, model no. PT-H5DN-2770, for $14.99 with free shipping. That's the lowest total price we could find by $7. Claiming an operating distance of up to 500 meters (0.31 miles), it features a max speed of 300Mbps, 5dBi dipole antenna, support for WEP, WPA2, and WPA-PSK encryption.