What parts? I used to know the guy that developed the MicroBike "production line" (back when they
were still in business ~8 years ago??). I might be able to find him (maybe 50% chance) and see if he
knows where any parts are stashed.
I have a MicroBike too, but it still works OK. I might need parts in the future--what wears out,
besides the many frame hinges?