Harman Kardon offers its factory-refurbished Harman Kardon CL Precision On-Ear Headphones in Black/Silver for $139.99. Coupon code "HKCLREFURB49" drops the price to $49. With free shipping, that's $16 below our June mention of a new set and the lowest total price we've seen. (It's also $24 under the best price we could find for a new set today.) They feature a 16Hz to 20kHz frequency response, noise-isolation, three-button remote, and built-in microphone. A 1-year Harman Kardon warranty applies.