Most human hair for better shaitlach is imported from Eastern Europe. There are ads on every lamp post where I live offering money for hair according to length, and for longer hair the money is enough to feed a family for a week or two.
Two high-end sheitel manufacturers make their better wigs in Ukraine, one here in this city (it is no secret – Freeda mentions it on her website and she has never used Indian hair nor does she mess around and substitute cheaper hair because it would be the end of her business) and one in another major city.