I know that as of last year, Ellen from Devine Paints was really good about working with long-distance customers. I know she worked with one local high-end paint store to specify all the pigments they needed to mix to recreate one of her colors.

She also worked with several other people before they ordered her paint by mail to ensure they really had the color they wanted.

I think people were almost more satisfied with her customer service than her paint, although they were quite happy with the paint. I don't know if she's able to offer those services now if the company has grown, but if you're considering her paint at all you might as well try to contact her first.