Normally, the launch of any new gaming platform is quickly accompanied by shortages. Not so with the 3DS. Despite brisk sales--the portable moved over 400,000 units in a single week in the US--a quick survey of retailers shows that the glasses-free, three-dimensional handheld is in abundant supply at a variety of retailers, such as GameStop, Target, and Best Buy.Nintendo says its planning led to an ample supply of the 3DS.That's not a coincidence, according to Nintendo of America president Reggie Fils-Aime. Speaking to USA Today, the executive said that this time around, his company planned to have its latest creation on hand in quantity."I would...