People often want to know where to find books of voodoo magic spells. Well, the answer is simpler than you might imagine. You can easily find these kinds of books online. Even professional voodoo priests are known to use spells from these books.
These sorts of books have become much less rare than they once were as censorship laws have been lifted and freedom of religion is accepted by more people. This means books of magic can easily be printed for people to learn from.
Of course, if you want to learn real voodoo you will probably need to be initiated by someone -- for remember that voodoo is not a universal term for "black magic" but is in fact a legitimate religion.