Newegg offers the TRENDnet 802.11n Wireless-N USB Dual Band Adapter, model no. TEW-684UB, for $30.99. Coupon code "EMCPDHP63" cuts it to $19.99. With free shipping, that's the lowest total price we could find by $11. This adapter features dual bands, up to 450Mbps data rates, and USB 2.0 connectivity. Deal ends June 26.