Check to make sure the bobbin case is in the machine. Also make sure the knee bar is there (usually stored inside the cover); it's in the photo. Both of these items would cost additional $$$ to replace if missing.
I bought a similar machine at a garage sale for about $30, but no oil can (they are worth a little) and no accessories came with it. $50 is about top price for what is in the photo, at least where I live.
Be sure never to pick up this machine by the handle. They are heavy, and quite frequently the locks break and the machine falls. Always support it underneath.