Please don't dump them.. I learned on a machine from the 60's that someone was going to dump.. and made my first quilt on it.. I'm sure someone can use it.. I picked a machine up on freecycle for a neighbor, cleaned it up, and she now is learning on it, and it hums.. People who can not afford a machine, and want to learn, would be happy to take it off your hands.. Where there is a will, there is a way, and just think.. You might get someone else to join the board..
Barri