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Get the TI-83 Plus Graphing Calculator with bonus free case for $79.99 shipped from Officemax.com. Plus, shipping is free. This is the lowest price by $10 and that's without the carrying case. This highly acclaimed device earns 4.8 out of 5 stars and is approved for use for AP, PSAT, SAT and ACT tests. Sales tax is charged in most states.