Harman Audio offers the factory-refurbished AKG K 840 Headphones in Black, model no K840KL, for $254.99. Coupon code "139K840" cuts the price to $139. With free shipping, that's $10 under our mention from last month and the lowest total price we've seen. (It's $91 under the best deal we could find for a new one today.) They feature AKG's Kleer technology, allowing 16-bit playback over a 2.4Ghz radio link, a frequency response of 10.5Hz to 31kHz, and up to 28 hours of playtime on a full charge. A 1-year Harman warranty applies. Deal ends May 17.