The reason i didn't put "quick" money, (rupees) is because it does take awhile. So this is what you do. First Make sure you don't have a lot of money in your wallet. Usually when you go into dungeons the first time, you don't find all the treasure chests right away. So, go into any dungeon and take a look at the map for any treasure chests. then head that way and get the treasure chest. There should be like a "100 rupee" in them. Like I said, it takes awhile. Good luck getting rich!