Sennheiser HD 650 drips to $306

If of all the Sennheiser HD 6**/7** headphones it is the new condition open-back over-ear HD 650 the one you want, you can get it in new condition for $306~ with free shipping at Amazon by Amazon actual. Free 2-day delivery for Prime members.

Or if you can wait until late March 2018, you can get the Sennheiser HD 6XX for $200 with free shipping at Massdrop. This is 3.5 months from blog-posting date, so that’s quite a wait in internet time 🙂