I got one from the weapons guy in act 5 that repairs. for some reason i cant remember his name....larzuk maybe? I also got one from Charsi in hell i think. but the easiest way to find them is to play baal games in hell and wait in town while someone runs/teles and look at malah's inventory of throwing weapons
For sure, everytime your in act 5 hell, check over the "useless" items those guys are selling, +3trap claws from anya come out alot also, and those oh so desirable echoing knives from malah, the smaller the weapon the better....less room in your stash.
Yeah, if you can find an "echoing balanced knife" from malah in act5 hell, those are really good space savers. For a while I was using an echoing great sword, and if i wanted to switch those out for my ali babas for boss mf kills - there was just nowhere to put the things
When you have 3 keys and you're about to make an organ out of them, make your red portal as close to malah as possible. After you got the organ, use the portal so you can refresh her inventory quickly by going trough the portal.