Newegg offers the TRENDnet 802.11n Wireless-N USB Dual Band Adapter, model no. TEW-684UB, for $14.99 with free shipping. That's the lowest total price we could find by $15 and the best price we've seen, outside of a deal for new Rakuten customers that offered it for $3 less two weeks ago. This adapter features dual bands, up to 450Mbps data rates, and USB 2.0 connectivity.