Do I really have to kill all the monsters to finish the (mini)quest or is it possible to buy some bones of the ge?
Unfortunately the bones required to the Wish List are all non-tradeable and cannot be purchased through the Grand Exchange.
Below are a couple of the bones, which says that they are non-tradable. I flipped through most of the bones and they all say the same thing
Orgre Ribs: Tradeable? No
Jorge Bone: Tradeable? No
Werewolf Bone: Tradeable? No
Zorge Bone: Tradeable? No