I had no idea, but according to Costume Studio, every year Americans spend billions of dollars on Halloween. The costume maker has paired up with MySpace’s cause arm, Impact. Along with MySpace Music, Stumble Upon and Invisible Children, they are inviting consumers to buy costumes for the benefit of Ugandan children. In fact, all profits from your purchases will find their way to this war-torn country’s children in need. To fill up your shopping cart, go here.