Two from venders, one from a chest, four or five from slots. Mind you, this is from ten playthroughs of normal and TVHM. --- Capcom won't see another damn cent from me until Mega Man Legends 3 is released.
I got a Legendary Assassin mod from one of the Dr. Zed machines in Sanctuary.... it was the "item of the day". Unfortunately it was only level 37 though. --- http://community.modnation.com/en-us/players/ZoomSurtr/creations