Just buy them in canifis if you are a member. If you are f2p, i'd be happy to get you some for free, just messege me in the game(socom12100) :D(but i'll only be on on the weekends)
Just go to the edgeville dungeon, kill the hill giants there, and bury their bones. Its easier than spending cash on bones and then ectofuncting them, and you get to train combat. :thumbsup: