First off you need to be lvl 30 horde character.
Next travel to Hillsbrad and go to the far south east corner of the map.
Next Start killing Dun Garok Riflemen
THey Drop Humbert's Helm at about 1.6% drop rate.
This helm on [U]some[U] servers can be worth around 30-40g because it is a twink item for rogues/hunters. Also since alliance can't kill Dun Garok it would be wise to transfer this to a alliance character and possible sell it for more.
Thanks for reading my thread and I hope its not a repost of old news.