Hi Dirk,
I've never had touch up paint made for my car. Two years ago, I had some paint matched to a piece of equipment in my office that needed some touch up. I had to buy a whole quart......about $15 dollars. But the match was perfect.
I don't mind picking up little nicks on my car and I'm not planning on touching them up. This way, when I hear the pebble hit the front end, I don't know which of the knicks was the latest acquisition.
Barry