Mystery Bag Headphone for $850 with coupon (*cough* Beyerdynamic T1 2nd gen *cough*)

Sonic Electronix is having a Mystery Bag Headphone Deal for $850 when you enter the coupon code MB1T2G over there. The regular price is $1099. When you follow the clues (semi-open, 5yr warranty, $1099 price) you arrive at the second generation of the Beyerdynamic T1 Tesla semi-open over-ears. This is a limited time offer, but I do not know the exact expiration date.