TRENDnet Dual Band 802.11n Wireless USB Adapter for $10 + free shipping
As one of its daily deals, newegg offers the TRENDnet N600 Dual Band 802.11n Wireless USB Adapter, model no. TEW-664UB, for $9.99 with free shipping. That's the lowest total price we could find by $12. It features WEP, WPA/WPA2, and WPS encryption and data transfer speeds of up to 300Mbps. Deal ends today.
2 very similar deals were also reported by some other sources: