I can't speak for CGL, but I do know more or less how it's worked in the past.
Basically, there are X Number of copies of the LE sold to the distributors. Depending on the distributor, retailers may be able to order them directly, but usually not. Usually, the retailer can order one for every X copies of the regular edition that they buy.
This model sucks for smaller stores, but when traditionally there are only 1000 LE's printed, and chunk of those go to direct sales through Battlecorps, Convention sales, and copies for the Dev and writing team, there's not really a good, fair way for Retailers to really get access to them.
RIght now, the LE is still available for pre-order from CGL. The Shipping costs kinda suck, but it is a way to guarantee a copy.
http://www.battlecorps.com/catalog/product...roducts_id=2241Good luck. I know I preordered my copy the day after the SR4A LE was announced.