Also consider that DTS mixes would have to be created, which would push back the release date for the set.
Also consider that DTS mixes would have to be createdThey had to create Dolby Digital tracks, didn't they? They could have done DTS at the same time. As for buying them seperatly, places like blockbuster will rent them individually and not as a set. It is possible that you might be able to pick up a used copy of Raiders at a video store.