Seamonkeys will come with the microscope.
At least, when I got a Tasco microscope in the late sixties, it came with a bottle of brine shrimp eggs, which I later read were “seamonkeys”.
One used to be able to buy “grab bags” or “surprise boxes”, for a small amount from electronic stores or Edmond Scientific. You’d get some junk, maybe floor sweepings, and usually some thing useful related to whatever the store sold. Probably more useful when you were starting, so you had junk for your “junk box”. Later, you already had enough junk, so why pay for more?
