Ritz Camera offers the HiFiMan HE400i Single-Ended Planar Magnetic Headphones for $224.99 with free shipping. That's $24 under under our mention from November and the best deal we've seen on these cans. (It's also a current low by $224.) These open-back headphones feature single-ended planar magnetic drivers, a 20Hz to 35kHz frequency response, and 35-ohm impedance.