As one of its daily deals, Amazon offers the Sennheiser HD 598 Cs Closed-Back Headphones in Black for $99.95 with free shipping. That's $150 off list and the lowest total price we could find. These closed-back headphones feature a 10Hz to 28kHz frequency response, 23-ohm impedance, two cables (3-meter and 1.2-meter), velour ear pads, and padded leatherette headband. Deal ends today.