NK, have I been lucky then, when you say there are not many about as I have come across a few here and there in the last two years. I now have four (two working, two unsure).
I came across one in appalling shape surface rust wise, so I took the useful bits off like starter, wheels and float chamber cap. Now wish I took the entire machine home -oh well some spares to show for it.
I came across another complete with catcher but couldn't get the handles to fold as the knobs were seized. I could have borrowed a ute but didn't bother. A shame as it was in very tidy nick all round with no bits missing. Won't do that again haha.