all loot drops are random
but the following can give a chance of titanium ore according to wiki
Bandits Nest you been doing
Outlaws
arctic explosion can drop a little
sons of the veld
surprise attack can drop a little i only ever do this addy with blocks though as big troop losses otherwise good XP though
nords
gunpowder if doing it and not worried about XP do fast version
victor the vicious can get 200/400 drop in this if lucky

i know your not level 42 to do these yet but i always see lootspots getting sold on both servers i play on for these 4 addys
roaring bull can get 500/800 drop servers i play on ls cost 1900-2200gc
black knights can get 250/500 drop again ls on servers i play 750-900gc
dark brotherhood can get 600/800 drop
secluded experiments can get 500/1000 drop

so there is a variety and if you cant do the addys yourself can possibly buy ls to hope to get some that way maybe? i havent included the little tailor addys as i know they may be out your price range to get ls in but they can drop some also