A new offering from refurbished computer supplier CDI aims to help school leaders solve one of their most difficult math problems–adding technology to more classrooms while subtracting costs. CDI’s new cart-based solution, Computers on Wheels (COWs), allows schools to provide an affordable set of name-brand laptops from Hewlett-Packard, IBM, or Dell to share among several classrooms. COWs consist of a lockable cabinet with a built-in wireless internet hub and eight, 16, 24, or 32 notebook computers, depending on the model selected. Only laptops that are capable of running current office document and educational software are included with the COWs cart, CDI says. In addition, customers can select makes and models from a variety of manufacturers, even mixing and matching if they choose. The COWs cart is manufactured using heavy 14-gauge steel, and each notebook slot has a foam lining. Pricing ranges from $9,199 for an eight-unit cart to $32,999 for 36-unit cart.