Newegg offers the Philips SHP9500S Over-Ear Open-Back Headphones for $49.95 with free shipping. That's tied with our August mention and the lowest price we could find by $18. (We also saw an open-box unit for $15 less in August, however.) They feature 50mm neodymium drivers, a frequency response of 12Hz to 35kHz, and 32-ohm impedance. Deal ends February 15.