BuySonic offers the Sennheiser HD 650 Over-Ear Headphones in Titanium/Silver for $279.99 plus $2 for shipping. That's $5 below our mention from last week and the lowest total price we've seen. (They're a current low by $45.) These open-back circumaural headphones feature a 10Hz to 39.5kHz frequency response, 300-ohm impedance, detachable cable, and aluminum voice coils.