Hobby Paint
You didn't say what kind of paint you wanted. If you want to use automotive enamels, any good automotive paint store will mix any color in the world for you in various types of paints, acrylic lacquers and acrylic enamels. Just bring in a color sample for them to scan and match.
If you want latex paint, almost any hardware store or paint store or home supply store can mix any color in the world in enamels and latexs. You can choose from the color chip displays in the store or bring in a sample for them to scan and match.