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NEW CASIO PRIZM fx-CG50 3-D Graphing Calculator Python 16MB Flash Memory USB AAA | eBay
Update: It really does go without saying, the FX-CG50 is a beast of a calculator. But my trusty FX-991EX is still good for a lot of things. They are both good calculators. :
Casio FX-CG50 Graphing Calculator - Black for sale online | eBay
FX-CG50 Manager | Software and presentation | School and graphic calculators | Products | CASIO