can only be bought at the auction house or from other players--since it drops off a mid-level mob called 'yagudo drummer' in the castle oztroja.
I suppose most folks could prolly get it themselves once they (or their party) are high enough level.
Check this thread for similiar information:
http://ffxi.allakhazam.com/db/item.html?fitem=2963
Edited, Tue Apr 6 02:29:50 2004