If you're looking for a good weapon for the Fortune Teller job type, you can find a Steel Ball for purchase at Kai Xin Specialty Store in Chinatown. The vendor sells it for ¥2,100,000 so make sure you can afford it. It's a huge upgrade over the default Fortuneteller weapon, definitely worth the cost. A cheaper alternative is the 20-Pound Ball at la chatte blanche which goes for ¥300,000.