mwave offers the PremierTek PowerLink 802.11n Wireless USB Adapter, model no. PL-150N, for $7.99 with free shipping. That's the lowest total price we could find by $2, although we saw it for this price together with a $2 mwave gift card in February, since expired. It features a max speed of 150Mbps, support for WEP, WPA2, and WPA-PSK encryption, and more.