Walmart offers the Dane-Elec TRON Legacy 4GB USB 2.0 Flash Drive, model no. TR-Z04GLBTB-C, for $5.57 plus 97 cents for shipping ($1.64/GB). (Free Ship-to-Store is also available.) That's the lowest total price we could find by $1. Sales tax is added where applicable. It features sound effects and lights and is compatible with Mac and Windows.