Adorama offers the Sennheiser HD 650 On-Ear Headphones for $409. Coupon code "SD12212014" cuts it to $294.99. With free shipping, that's $29 under our mention from a week ago and the lowest total price we've seen. (It's a current low by $54, although most merchants charge closer to $400.) Features include a 10Hz to 39.5kHz frequency response, 300 ohm impedance, aluminum voice coils, and titanium finish.
Need them for Christmas? Upgrade to 2-Day shipping for $21.75 and order by 8 pm on December 22.