Blinq offers the open-box Sennheiser HD 598 Cs Closed-Back Headphones in Black for $106.89. Coupon code "SENN20OFF" drops it to $85.51 with free shipping. That's $14 under our July mention of new headphones and the lowest price we've seen for these headphones in any condition. (It's the best deal by $14 for a new-in-box pair today.) These around-ear headphones feature a 10Hz to 28kHz frequency response, 23-ohm impedance, and 2 detachable cables (9.9-foot and 3.9-foot with 1-button remote).

Note: No warranty information is available, but the vendor does offer a 30-day return policy.