for the guys that are going to target MF: The following is the best drop rate for Humungous
Diablo - diablo (N) The Chaos Sanctuary 1:198
Baal - baalcrab (N) The Worldstone Chamber 1:213
Andariel - andariel (NM) Catacombs Level 4 1:233
Mephisto - mephisto (NM) Durance of Hate Level 3 1:257
Diablo - diablo (NM) The Chaos Sanctuary 1:269
Baal - baalcrab (NM) The Worldstone Chamber 1:278
I've found a few of them from nm chaos runs now, its been my best luck. None perfect yet, but they are there!