Mushroom - 3 of them, each on a different character, first time through normal...
Shinbone - 4th character through the manor
Liquid Rainbow - first time (but only one thus far) - wasn't even looking for it
Gemstone - At least 10-15 tries.
Plans - at least 7-10 tries
Bell - uh, bought it when I had the rest of the stuff.
Haven't made the staff yet though.