To get money with almost no effort at all,you must do the Item Dupe trick.(Must have 3 characters first).Dupe the Potion Berry which is a rare item,but you'll pick it up really early in the game.After you have 255 of it,SELL 155 of them or you can sell all of them.Each berry is priced at around 500.155 of them can get up to 50,000!