Dude I had the same issue...
If its in Black, then they have then in stock RIGHT NOW... They just don't know it because most people that work there are tards... I went in, asked for it, guy goes "Uhh, its on the shelf, if its not there, we don't got it"... I'm like "No gumby, these are $400 cards, they won't be on your shelf...".. He looks on the computer, says they got 2 in stock, and he goes "Sorry, computers wrong.." and walks away...
I finally find my friend that works there, that knows all this crap, and he goes "Well, I think we got em, let me check, they won't be on the shelf though."... He walks around, talking to a few people, finds them up on the canopy, and moves a ladder over and grabs one and he was pretty impressed with its looks. =) Anyway, he said they are either up on the canopies, in the locked cages on the floor, or in the locked cages in the back room... The thing is, most retards at Best Buy don't know where to look for them...
I had my pal check the computer, and almost every store in the area had 2-3 in stock, and 99% of the people working in them don't even know it. So my best advice, head up to the store with the SKU of the card, have them directly check on the computer their counts.. If it says they got em, they got em, just have people look for it, and don't leave till they find it.. If that store is out, write down the names of the other stores that have them, and make customer service call and hold one.
Best Buy SKU for this card is: 6684652 Model Number is: BFGR68256GT
Good luck! My pal says MOST stores Nationwide have 2-3 of these in stock, but its a chore to find someone NOT-LAZY to find them... Oh, and this card is definately heavy as heck, and even lights up blue in your case.
http://www.boredmofo.com/downloads/bfg6800gtinside.jpg