I got mine from Leslie's Bow-tique
and has about 66 colors on it. I just added a few of mine that she didn't have on there myself.
As far as the width, the color should be the same with all of the widths I would think so it wouldn't really matter what width it is. The samples I have are 3/8" ribbon and are 1" long, so they give me enough to be able to match up the colors when I need to, etc.