Texas Instruments TI-83 Calculator $80
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Normally $100, the Texas Instruments TI-83 Plus Graphing Calculator is just $79.99 at Office Depot after this $20 off $75 coupon (code 22799621 - expires 11/24). The most popular graphing calculator, the TI-83 Plus features graphing capabilities used in calculus and trigonometry. Delivery is free, as is in-store pickup where available. (Instructions »)