Unfortunately in the good ole USA the only sources for true wrought iron are scrapyards, junk dealers, blacksmiths, etc. Some old bridges, pre 1900 (not still in use please!), some railroad hardware, old wagon tires "hoops" although these are mostly lower quality, Jail bars. It's getting harder to find...
There is a British company re-rolling wrought iron. $$ to ship it here though. Hope this helps.
Dennis