The TI-84 Plus graphing calculator is on sale for less than $90
7:55am PDT - August 16th, 2019 calculator - MashableTL;DR: The forever-useful Texas Instruments TI-84 Plus graphing calculator is on sale for $88 at Walmart, saving you $28. Since the dawn of time (okay, 1990), high school and college algebra classes are known for requiring those damn graphing calculators. Wil…