Amazon has the Casio FX-115ES PLUS Engineering/Scientific Calculator $8.03 + Free Shipping w/Prime
- Natural textbook display shows expressions and results exactly as they appear in the textbook
- Over 280 functions, including fractions, statistics, complex number calculations, base arithmetic, linear regression, standard deviation, computer science, and polar-rectangular conversions
- Multi-replay function allows you to backtrack step-by-step through calculations, where you can edit expressions and recalculate answers
- Best Seller: #1 Best Seller in Scientific Calculators
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