BuyDig offers the open-box Sony MDR-1A Over-Ear Headphones in Black for $298. Coupon code "C1172242745" drops it to $149. (The discount appears at checkout.) With free shipping, that's $56 under the lowest total price we could find for a new, factory-sealed unit. (For further comparison, we saw a new one bundled with a $100 gift card for $298 in January.) Features include a 3Hz to 100kHz frequency response, detachable cord, 24-ohm impedance, and 105dB sensitivity.
It includes a Sony warranty but no duration information is given.