Matrix from Black & Decker is an interchangeable tool platform that’s like holding a complete workshop in your hand. The power base is compatible with a range of attachments which help you drill, cut, sand and a whole lot more. This cordless system runs on a lithium battery that will maintain its charge for up to 18 months. The power units start at $49 for 12 volt and $69 for 20 volt, and the attachments (including drill driver, impact driver, jigsaw, sander, router, and trim saw) range from $29 suggested retail to $39. Available at all major retailers, including Home Depot, Lowe’s, and Walmart.