The Stylist 514 has several plastic (nylon?) gears and is from the era where these become problematic...one of them eventually breaks. In my mind, it is a crap shoot whether you get years of service or a short lived machine.
has several replacement parts and service manuals.
My own personal feeling (not market based at all) is if it is currently running well, I'd risk $25 but I'd probably walk away from $50.