mwave offers the PremierTek PowerLink 802.11n Wireless Ultra Long Distance Indoor and Outdoor USB Adapter
, model no. PL-2712N, for $36.99
with free shipping
. That's the lowest total price we could find by $8, although it was $1 a week ago (since expired). Claiming an operating distance of up to 2,000 meters (1.24 miles), it features a max speed of 150Mbps, 12dBi dipole antenna, and support for WEP, WPA2, and WPA-PSK encryption.