Newegg via eBay offers the Philips Over-Ear Open-Back Headphones, model no. SHP9500S, for $54.99 with free shipping. That's the lowest total in-stock price we could find by $13, although we saw them for $2 less during Black Friday week. They feature 50mm neodymium drivers, a frequency response of 12Hz to 35kHz, and 32-ohm impedance. Deal ends March 6.

Update: The price has dropped to $49.