Clover

Clovers can only be found in the Shire. Normal clovers are totally worthless and can easily be found all around the Shire, but with some luck and exessive search, you may find a four-leafed clover, which will bring you luck, if you keep it (Or at least it is said so...). OR you can sell it to a hobbit bartender, who will pay a high price for them.