I think I will probably buy any that I find, like you I like the blacks but the LBOW looks pretty smart also. We do the yard sales every weekend but SM seem to be rather scarce here. Last weekend I saw a treadle only because I said I was looking for one and the lady said "Oh, come inside I have one." It was not very nice. This weekend after about 20 or more sales and stopping for lunch at a local farmers market, as we left there was a cardboard sign with an arrow so we followed it. There was a portable in its case and a treadle with a book in the drawer for 127/128.
We were talking about this and we have a large influx of Canadians from the colder parts of the country especially when they retire and perhaps the older machines are left behind and then they buy a modern one when they get here if they are going to do any sewing.