I got it for $80 at launch, which included the limited edition box, comic, and the halo 3 map pack 2 weeks before release. It also included 2 unique in game units and allowed me to support ensemble studios last game.
I don`t see Certain Affinity staying around long, as they are a 3rd party developer. On a side note, they also made the blastacular map pack for halo 2 (Tombstone, Desolation)