Mwave offers the Powerlink Outdoor Plus II 802.11n Wireless Ultra Long Distance Indoor Outdoor USB Adapter, model no. PL-2812-300N, for $34.99 with free shipping. That's the lowest total price we could find by $48. Claiming an operating distance of up to 2,000 meters (1.24 miles), it features a 12dBi panel antenna and support for WEP, WPA, WPA-PSK, WPA2 TKIP/AES, and WPA2-PSK encryption.