Those are priced too high. They are not in the best condition so I would pay 50 at the very most. I would take the treadle. Much more fun. I was sewing on a treadle at age 7 so you can certainly do it.
Check the tutorials for Billy's instructions on cleaning, etc. And he will answer any questions on the Vintage thread.
BTW, I've been to Monck's Corner. DD2 used to live in Summerville.