That's because it wasn't just for the 128K. And as of September 1984, it was bundled in the same box with the system software. By 1986 it was sold separately to appease third party developers.
Based on prices I've seen, you may end up paying as much for the individual items as you would for a complete bundle, including the 128K. Good luck.
I personally don't see the need to own all the components that originally shipped inside the original box. I have a few original boxes and they sit in the garage taking up a huge amount of space, collecting dust. Even in 1985, I thew all of that stuff away. Disks were kept in a disk box on the desk, the audio cassettes were kept with my cassette collection, and all of the other stuff was either on a bookshelf, in a file cabinet, or in use on the computer, all of the plastic and cardboard boxes discarded. The same is true today. The only reason I would want all of that stuff is if I built a shrine in my house for the 128K, which holds no appeal for me. Otherwise, my 128K exists pretty much in the same state as it did in 1985, and is just as useful, and actually inspires the same sort of awe in people as it did then, though for different reasons.
Based on prices I've seen, you may end up paying as much for the individual items as you would for a complete bundle, including the 128K. Good luck.
I personally don't see the need to own all the components that originally shipped inside the original box. I have a few original boxes and they sit in the garage taking up a huge amount of space, collecting dust. Even in 1985, I thew all of that stuff away. Disks were kept in a disk box on the desk, the audio cassettes were kept with my cassette collection, and all of the other stuff was either on a bookshelf, in a file cabinet, or in use on the computer, all of the plastic and cardboard boxes discarded. The same is true today. The only reason I would want all of that stuff is if I built a shrine in my house for the 128K, which holds no appeal for me. Otherwise, my 128K exists pretty much in the same state as it did in 1985, and is just as useful, and actually inspires the same sort of awe in people as it did then, though for different reasons.