iTechDeals offers the Belkin N750 DB Wireless Dual-Band USB Adapter, model no. E9L7500, for $19.99. Coupon code "N7504OFF" drops it to $15.50. With free shipping, that's $3 under last month's mention and the lowest total price we could find by $41. It features dual 300Mbps and 450Mbps WiFi channels.