Easy way to make money
An easy way to make money is by going to the "Flight by Vow". Pay 20 rupees, then fly to the cave where their are 3 giant statues of snakes. Fly on top of one of the statues and their are 3 treasure boxes. Open all of them. and you'll be a lot richer. ( You must have the clawshot to go on the other two statues).