They have about 200 sets remaining with 10 minutes to go for the deal to end. They are probably not going to sell out before the deal ends.
Probably the deal was not out there for people to see. It is still a very good deal for the TV.
Ya looks like they did not sell out. The price would be $348 now without the door buster deal. The only other major retailer that has it for the same price ($348) is Walmart.
Having said that, only seller with lower price as of now is $298 at BuyElectronicsMall.com . I haven't bought anything from that website before to know about their repute.