These are some of Massdrop's most-requested headphones. They'll ship in March of 2018.
Brad's Deals Editor Jim,
These open-back Sennheiser HD 6XX Headphones listed at $499.95, but you can get them for $199.99 when you order with a free account at Massdrop. Shipping is free. That's the best price we can find anywhere by about $116, and it matches the best price we've ever seen for this style. The 6XX model is based on Sennheiser's HD 650 headphones, only they're designed especially for Massdrop. I've listened to these with an amp and DAC, and they have the best sound stage of any headphones I've ever heard. Supplies are limited. Note: Once you sign in as a free member and join the drop, you'll be charged on or before 12/28. The headphones are expected to ship 3/28/2018. Sales tax is charged in most states.