just a tip form a previous black friday, Even though they may say they ran out of a specific item, if you really want it look around. I was too late for a 25 dollar mp3 player once, and snooped around. Sitting underneath a cash register was one, and I quickly asked if it wad taken. The cashier said somebody didn't want it, do I quickly bought it.
Don't loose hope, and even if there are none left, don't get violent, there will always be more sales!