Slidecage is correct. Nutcases with nothing better to do and no jobs apparently have left their local Occupy encampments for a few days/week to camp out at Best Buy and spend their unemployment/welfare on these TVs and other things. LA has 50 or so Best Buy stores in the county, probably more, and already most if not all have people camped out in front.
If you still want that TV, your best bet is to grab your camping gear and head to the local Best Buy. If you see that there is no line formed yet, either camp out or check back daily or twice a day and start camping the moment you see others there. If the line is already 10+ people, forget that option as odds are they will also bring friends/family out to get more of the hottest items (the 42" Sharp, the iPod + GC, $80 Dynex 24", cheap laptops etc.).
If that's the case, your best chance to still get the TV would be to show up 15 minutes prior to the midnight opening Thursday night and offer $100 cash for a TV voucher/ticket. Someone with one might take you up on the offer. You might also end up causing a fistfight, riot, or brawl, which we will all enjoy watching on the BF highlight reel.
I'd rather just pay an extra $50-$100 and order it off Best Buy, or even better, wait for amazon's inevitable TV deals, one or two of which will undoubtedly be comparable.