Ok Doug, I'll reply because no one else is going to for the same reason I passed on replying yesterday.
First - It was somewhat insulting to ask for the help but to imply that you might be raped in people giving it. What would a slight profit be? Can you imagine a slight profit on a single ring being worth anyones time? My time is worth $200 an hour. Just driving to the post office to mail it to you would burn through your "slight profit".
2nd- Are you Fing kidding? A single ring for a single piston? No one has this because everyone would throw them away after pulling them out of a motor. Plus it is oversized and only a few fools like me run an overbore.
3rd - If the motor is torn apart, you are being penny wise and pound foolish replacing just one.
But to answer your 2nd question. Yes, buy a new ring set.