Can you buy a new miyata unicycle in the us, or online anywhere?
Try here:
I have ordered seat posts from Miyata/Japan several years ago. They messed up one order and sent me 1 seatpost instead of the 2 that I ordered, but they corrected the order and sent me the 2nd one. This was before they re-designed their web site. I’ve not used this latest web site.
I also see this site but I can’t find the English language option on it:
You might also ask unicycle.com if they can order for you.