I don't have a reliable US codes either! Not ideal but the closest I've got is with photo's I've taken, Imported with Photoshop, use a dropper tool to get a RGB / CNYK code and find a Pantone equivalent...
Not ideal, but hopefully this will get me close-ish....
Anyone got any Pantone Chips and an unpainted Pac-Man (or one in the right colours) for me?
Thanks!!