Can you play and RPG and save money at the same time? Yes. Now you can with BankQuest: A Tale of Savings!

From the blog article:
In August, toymaker Takara Tomy is releasing this ultimate piggy bank for gamer geeks. It's called BankQuest: A Tale of Savings, and it's a dungeon-shaped vault with a LCD screen that turns your penny-saving experience into the ultimate role-playing game. Every time you feed it a coin, the screen will update you on how much you've saved and tell you what weapons you can buy with that money. The more you save, the bigger weapons you can buy, and the closer you get to successfully beating the Money Monster.
The RPG piggy bank will retail at about $40.
I love eating fish and chips, don't you? If you do like them then learn how to prepare your very own special fish and chips meal!