Quote from ent0mbed
Hate to break it to those of you that didn't get a CE (I didn't either as I wasn't even aware that it was officially available for pre-order), but you're gonna be out of luck unless you want to purchase one on ebay or luck into a store that has some extra on the shelves (like a Walmart or Best Buy). Once the pre-orders for Burning Crusade and Wrath of the Lich King sold out... they were gone. I remember this very well because the WotLK pre-order sold out in like 3 days or something and my wife was ready to kill me because I missed out on it. There won't be more.
Like I said, there's a small chance you'll find some on store shelves on the day of release (there are still Cataclysm CE's on the shelf at my local Best Buy). Blizz has had companies making the contents of the CE for a long time now and they had them make a specific number of those items that go in the box. They've never printed extra CE's int he past... they aren't going to do it this time.
This man speaks the truth. Which is why I pre-ordered on Amazon the day the CE was announced; I knew this would happen. It's not like they (Amazon) charge you initially for it, basically you're just reserving yourself a copy.