Sennheiser HD 600 Open-Back Pro Headphones + $150 Amazon gift card: $400 shipped ($550 value)

Amazon is once again offering the Sennheiser HD 600 Open Back Professional Headphones with a free $150 Amazon gift card for $399.95 shipped. With the value of the gift card, the headphones carry an effective price of around $250. The HD 600s still fetch the full $400 from just about all trusted retailers. Today’s deal is matching our previous mention on these high end cans and the best price we can find by more than $100.