Well I'm not a lefty but I married one so I know the deal.
I would search for a Model 70 used in SS they are around. I know a fella in Oregon that just bought one a few months ago. I know another guy that had two and wanted to sell me one. I don't need a lefty rifle though.
Don't know what to say, it's not an easy situation. The best second choice is to buy a Blued Model 70, and then send it to Roguard for their complete Rogard treatment trigger tune, and NP3 internal treatment. Even though mine are stainless I still sent them to Roguard to have this done. They are very good with metal coatings and can turn a blued rust prone gun into a marine safe hunting tool.