I'd be surprised if any local paint suppliers would have any info on hammer and metal finish work. Collision repair shops don't do the type of metal finishing that you would want to do on an old car. They rough the shape back in and cover the whole thing with filler. If it's really messed up they just replace the panel.

I tried buying some body work tools locally a few years back and had to order the stuff online. I was told there is no demand for metal working tools so they stopped stocking them.