Lew from unbox therapy just posted an add today that's sponsored by mass drop for the HD6XX so they should be re-dropping it soon.
https://youtu.be/xnIjKwmRKKc
I don't know if you guys were willing to spend $300 more... but https://en-us.sennheiser.com/audiophile-headphones-high-end-hd-650. The Apogee Groove is ~$300 on Amazon and their official Apogee website, so technically you can buy the headphones for $200 xD, and the cable is about ~1m with a 3.5mm jack. Trying not to sound like an advertisement, but its what I found for some deals if anyone was interested and doesn't mind including a DAC/AMP with the HD 650. Though I can see for a lot of people, being FORCED to pay another $300 for a dac/amp you may not even want defeats the purpose of the price for the headphones xD.