If you live near a golf course this is an easy money maker. First, check the rules because certain golf courses may not allow it. Basically, just walk around and pick up golf balls that are left behind in the bushes and natural areas. Just don’t take a ball if a golfer is using it only take them if you are 100% sure they are left behind from a while ago. Wash the ones you find and then sell them to golfers driving by. One of my cousins lives in a golf course neighborhood and made $250 dollars in a month over the summer.