For many cyclists, this is a time to celebrate, because now you don't have to worry about the first scratch.

I have never heard of touch-up paint from bicycle manufacturers.

There are 4 common suggestions in threads where this question is asked.

1) Go to an auto parts store and get the closest automotive touch-up paint

2) Go to K-mart (or elsewhere) and find a nail polish that closely matches the colors.

3) Get the closest model paint (or mix a couple of different colors if you are skillful) and use it to touch-up the scratch.

4) Don't sweat it, bicycles aren't that fragile, and are made to be ridden.