Moss is a plant ruled by Jupiter, the planet of money attraction, good luck and success.
Scrape some moss from a gravestone on a Thursday, ruled by Jupiter also, place it on a sheet of paper and add a small coin to the moss. Fold your paper up, and seal it with tape,
Holding your charm in the hand your write with, chant this spell:
Moss, moss, ensure I can afford to cost.
Now hide your under your bed and wait for your spell to work