Hello, I suggest Stuller.
I was there on a tour a little over a year ago and observed the
rolling department getting ready to scrap a very long piece of flat
stock because it had minor surface imperfections on one edge. I'm
sure it's the type of thing that happens to all manufacturers
periodically, but not everybody is as discerning. I've ordered from
Stuller for almost 30 years and don't remember getting any surface
blemishes on any metals.
Usual disclaimer applies, just a satisfied customer.
James S. Cantrell CMBJ