First off, NEVER buy from an unauthorized dealer. Any store with a lower price than Best Buy and Amazon are NOT authorized dealers. Technically, Samsung can deny your warranty if it's bought from an unauthorized dealer. The only benefit from an unauthorized dealer is getting an authorized dealer like Best Buy or TigerDirect to price match if you nag them and threaten to take your business else where enough because even then price match policies only price match with other authorized competitors which will almost always have the industry MSRP for the TV. Which kinda makes the price match a very good marketing gimmick. But still, ALWAYS buy from authorized dealers.
I am near TigerDirect's store front in Naperville IL, and I got it from them and got 100 bucks taken off a 3 year extended warranty. My first UN55F8000 had pixel blemishes, basically tiny air pockets in the panel. Brought it back the next day, manager lifted the Styrofoam to make sure the TV was in the box, helped me load another one off the shelf into my car and that was that, didn't even scan my receipt or anything just looked at it and matched the model number on the box. He even apologized and joked around and said "I told you, you shoulda gotten the Sony." He even gave me his phone number to text him if anything was wrong with this second TV.
Got home and the second TV was pristine and keep in mind, after that point I still had 29 more days on my return/exchange period. So even if this one messed up I could go back. and because TigerDirect is a store/warehouse, they had TEN of the UN55F8000 in stock, where as Best Buy would only have one in stock and they would have to order another one and that eats into your return/exchange period. Always make sure there is at least 3 extra units besides the one you're picking up in the event an exchange needs to be made.
I could have gone online and gotten the TV for 500 bucks less, YES. But you are taking a HUGE gamble because of issues like the one you're experiencing. I always recommend spending the extra few hundred bucks just for the peace of mind that you can easily exchange it within a months time AND Samsung will 100% honor their 1 year warranty. And if THAT wasn't enough to convince you to go with an authorized dealer, you get face to face customer support and RESPECT with store fronts if gosh forbid an issue comes up.
I really hope Samsung takes care or you, but from my experience, what customers say, and what salesmen say ALWAYS go with authorized store fronts whenever possible. Online retailers are a huge pain in the arse to do exchanges/returns with.