They don't pop up much by me or at all.
I also, was looking at your NJ Craigslist. You have the same variety and quantity squaretop machines we all do.
If the machine looks bad in the picture, better for you. They clean up easily and are pretty simple to refurbish.
Don't pay a lot of attention to the price, if a machine has been listed for a month with no bites...........well you know what to do.