Obviously they have run out of allocation, however most retail establishments (especially gamestop) don't actually hold product, they sell-through. So unless the hardened edition is actually super-limited (which it most likely will not be) then you can just walk in and buy one as long as you aren't a dick about it.
Also: it's only $10 different to buy the regular and elite, and I THINK you can buy Elite w/ ms points so if worst comes to worst and you can't wait you can just buy the game itsself and MS points since you have credit at the store. I would just wait though, because that edition isn't actually going to be limited. It's an easy way to (in my opinon) trick people into spending an additional $40 because they think it's a $10 savings from normal Elite price when really it's an unneccessary add-on that costs almost as much as the game itsself! /rant