Even if you could find one at a Jumble you'd be lucky to get one for less.
Which is why I gave the advice in the original thread.
This is no longer a poor mans hobby, sad to say. Ride the bike, do it a bit ata time and keep looking.
I need a peculiar propstand for a bike I have had for 40+years, 3 years ago I found half of it. I expect in another 30 yrs I'll find the other half, but the bike has run very well without it.
Hang in, as all us old guys die off the market will be flooded with spares that our heirs will dump, the joke is that only us old guys know whats what.