As a reader discovered, newegg offers the TP-LINK 802.11n Wireless USB 2.0 Adapter, model no. TL-WN722N, bundled with a USB cradle for $17.93 with free shipping. (The cradle is added to your cart automatically.) That's the lowest total price we could find by $12. It features a 4dBi omni-directional antenna, a maximum data transfer rate of 150Mbps, 64-bit/128-bit WEP/WPA/WPA2/PSK/2-PSK support, and more.