Harman Kardon again offers its factory-refurbished Harman Kardon CL Precision On-Ear Headphones in Black/Silver, model no. HARKAR-CL-Z, for $49 with free shipping. That's tied with yesterday's expired mention as the lowest total price we've seen. (It's also $29 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.