Amazon offers the TP-LINK 802.11n N300 High Gain Wireless USB 2.0 Adapter, model no. TL-WN822N, for $12.99. (Newegg via eBay has it for the same price.) Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $8.33.) That's $2 under our August mention and the lowest total price we've seen for a new unit. (It's a current low by $7.) It features dual 3dBi omni-directional antennas, a maximum data transfer rate of 300Mbps, and 64-bit/128-bit/152-bit WEP/WPA/WPA2/PSK support.