This item drops randomly in Tanaris from * Wastewander Thieves and Bandits * Southsea Pirates, Freebooters and Swashbucklers * Sandfury Shadowhunters, Blood Drinkers, Witch Doctors, and Shadowcasters (in Zul'Farrak) * Searing Roc The drop rate is reported as between 0.5% and 1%. As is common for items that start quests, the real drop rate is somewhat higher, since while you have one of these - or have finished the quest it provides - it will not drop for you again.