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I've seen copper, silver and gold bars, but have never seen nickel bars. Any idea where they are available and are the premiums just as ridiculous as they are with copper?

Pure nickel bars are rare. You might have more luck finding nickel shot. Truth be known, much of the nickel mined in the last year went to overpriced stainless steel appliance covers (double price refridgerators, etc.)

Art bars are a small fortune: http://coppercave.com/copper/index.php? ... t&catId=55

KitcoMetals states that there should be 262,000 tons of nickel in what should probably be mostly bar form out there... But I've never seen one either.

You might do a search on feebay in the bullion area...recently they had at least one 999 round, also nickel shot, not sure if there were nickel bars, I think I saw some but I may have just been numb from the cold.