Cowin via eBay offers the Cowin E-7 Active Noise Cancelling Wireless Bluetooth Headphones in several colors (Black pictured) for $49.99. With free shipping, that's tied with our mention from last November, $20 off, and the lowest price we could find. Buy Now Features 40mm drivers swiveling earcups in-line mic frequency response of 20Hz to 20kHz 30 hours of playtime in Bluetooth mode on a single charge