Try an automotive paint shop. Any city with a decent number of body shops will have one.

I needed a spray can for some touch up on our 4ES under-door molding. My dad talked me into going to the specialty shop vs. ordering online from AutomotiveTouchUp.com or similar. This turned out to be good advice. They took the paint code and mixed me a can. Ours is that pale sea green metallic, I forget the actual name. It was about $20 or same as getting it online from the code as I recall.

It did not match well. They then took a hodded digital photographic device and “shot” an image of the paint to create a custom blend. The machine came back that it actually perfectly matched a Mitsubishi code, so they mixed me up a can based on that code, and it matched perfectly (it was the factory paint btw, never re-sprayed anywhere before). And at no charge since the first one didn’t match, though that was no fault of theirs and I did not ask for a discount/refund.

So check out that route - ask a body shop who mixes their paint if you can’t find the local shop yourself.