Adorama offers the HiFiMan HE560 V2 Premium Planar Magnetic Headphones for $249.99 with free shipping. That's $49 under last week's mention and the best price we've seen. (It's a current low by $649.) This version features:

upgraded suspension headband and metallic colorway

single-ended planar magnetic drivers

45-ohm impedance

frequency response range of 15Hz to 50kHz