As one of its Prime Day deals, Amazon offers Prime members the Sennheiser HD 598 Special Edition Over-Ear Headphones in Black for $109.99 with free shipping. That's $13 below our April mention and $44 under the lowest total price we could find for any color elsewhere. These open-back headphones feature a 12Hz to 38.5kHz frequency response, 50-ohm impedance, two cables (3-meter and 1.2-meter), velour ear pads, and padded leatherette headband. Deal ends today.