As one of its lightning deals, until October 30 at 2:45 am ET (or 100% claimed), Amazon offers the Sony Studio Monitor Series Stereo Headphones in Black, model no. MDR-V6, for $49.99 with free shipping. That's the lowest total price we could find by $30, although we saw them for $20 less last month. They feature a 5Hz to 30kHz frequency response, 40mm drivers, 10-foot cord, and 3.5mm connector with 1/4" adapter. Deal ends October 30 at 2:44 am ET.