As one of its Prime Day deals, Amazon offers Prime members the Sennheiser HD 598 Cs Closed-Back Headphones in Black for $99.95 with free shipping. That's tied with our March mention, $25 off list, and the lowest price we've seen. These around-ear headphones feature a 10Hz to 28kHz frequency response, 23-ohm impedance, aluminum voice coils, two detachable cables (9.9-foot and 3.9-foot with 1-button remote), velour ear pads, and padded leatherette headband. Deal ends today at 11:35 pm ET or when 100% claimed.