On Monday Nintendo officially launched the Wii Fit. Much like the premier of some movies, however, it’s only being launched at one location: the Nintendo World store in New York City. Other retailers will start selling the Fit on Wednesday.At an MSRP of $89.99, Wii Fit comes packaged with the Wii Balance Board™ accessory, a precisely engineered platform that senses both weight and shifts in movement and balance. The Wii Balance Board connects wirelessly to the Wii™ console and serves as the centerpiece