That’s especially true when you have to buy a new graphing calculator. Right now, Amazon and Walmart have some of the most common Texas Instruments graphing calculators at their lowest prices of the year, which is convenient since kids will be heading back to school before you know it. This is a very typical calculator required for high school math classes, especially at the higher level. This graphing calculator has a full-color screen and an assortment of pre-loaded utilities to handle the most common tasks. More Texas Instruments calculator deals