RGB to Model Paint Conversion

I am looking for a way to take an RGB code and figure out what combination of paint I can mix to get even close to the correct value. Is there a chart somewhere that lists the available colors from various manufacturers with the RGB values of each paint. CMYK would be OK too. I can do the conversion if needed. I’ve been wearin’ out da Google and haven’t foudn anything yet.

Thanks, folks.

I’ve been looking for a paint match system for a long time. The systems that are in the paint department of Lowe’s or Home depot might do the job, however, they cost too much. I looked it up on the internet once and decided to mix and match by eye.