Dear Brian,
Well, I do not know if it is the largest community of Japanese people outside of Japan there. Searching the internet I not found many collectors Nihonto, only collectors of modern swords Japanese style (Paul Chen, Brandon Sword, etc.), Generally are practitioners of Iaido, Kenjutsu, Tameshiguiri etc. As far as I know the Japanese community to which you refer is in a neighborhood called Liberdade in a state called Sao Paulo. Brazil is a state the size of a continent and I live near the north end, while Sao Paulo is almost at the southern end, so it is difficult to travel there (time and cost). Never tried searching on social networks (Facebook, Orkut), then maybe this is my error! Anyway, still can not get books in my language, but I'm starting now and will have to search very, buy the books and study hard! I thank all of you here in the forum for your patience and help they are giving me! Hug!
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Jair Francisco da Silva Junior