Today only for its newsletter subscribers, newegg offers the ASUS Black Diamond Dual Band 802.11n Wireless 300Mbps USB Adapter, model no. USB-N53, for $39.99. Coupon code "EMCNGND45" cuts it to $24.99. With free shipping, that's the lowest total price we could find by $12. It features data transfer speeds up to 300Mbps, live signal monitor, and more.