I think you have received some very good advice here. If you offer a low price, you can always go up if needed. Be sure to take a sewing machine needle with you when you go to try it out. It may not have one in it. I keep a machine needle, 2 small spools of thread, one for bobbin and one for top thread to check the tension, and a small pair of scissors in my purse. You never know when you just might see a machine you want to try out. Good luck, and let us know how you come out on the machine. (I'm a former Michigander, as they used to call it.)
Janis