Sennheiser HD 600 + $150 Gift Card for $400 total

This is not a bad deal at all. For $400, Amazon bundles the new condition open-back over-ear Sennheiser HD 600 headphones and a $150 Amazon Gift Card (plastic gift card delivered by mail). That puts the headphone at $250 since you can use the gift card for its face value or even sell/trade it for close to that amount. Or hand it off to someone else as a holiday gift. No coupons, no rebates, just add to cart and checkout.

TIP: in the remote chance the gift card arrives before the headphones ship, you may be able to apply the value of the gift card towards the purchase. This rarely happens, in the lightning strikes neighborhood.