Q: I want to have a workable Macintosh 128K; the first Macintosh that came out in 1984.
A: I suggest an alternative answer. Contact some of your universities or colleges in your area. I remember using an Apple IIe back in 1983. Something most people do not think about are universities and colleges that are state owned. Here in Oregon, the State of Oregon has a salvage program where they sell off state equipment at auction for cheap. You might find that a college near you would have some very old computers stuck somewhere in a basement they have never gotten rid of and would either give it to you for free or sell it to you for next to nothing.