Hate to parrot everyone, but early camping at BB or CC are your best bet. If you're not within the first, probably 20 in line, you're screwed. Gamestop, EB Games, etc. are pointless. They MAY have ONE that they'll hold for the floor, but obviously that'll be gone fast. All the rest went in pre-orders within an hour.
I was able to pre-order from Gamestop and they were only getting 12 per store.