Most retail stores learned their lesson about keeping around a megaexpensive version of a game, that is sure to sell to the diehard people, but not anyone outside of that (See: the ~6 copies of H3 legendary version that are still cluttering up by back stock room). Much better idea for that to be Amazon only.
Haha, the Gamestop down the street from me had about 6 Legendary Halo 3s sitting out by the registers. And it opened up about 6 months ago, so no doubt it's extra stock taken from somewhere else.