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$10
Used maybe one time. CASIO fx300ES and fx300MS
http://www.amazon.com/Casio-FX-300ES-Solar-Scientific-Calculator/dp/B0009OTG6G/ref=sr_1_2?ie=UTF8&qid=1446578253&sr=8-2&keywords=casio+fx-300es
http://www.amazon.com/Casio-FX300MS-fx-300MS-Scientific-Calculator/dp/B00004U12N/ref=sr_1_1?ie=UTF8&qid=1446578286&sr=8-1&keywords=casio+fx-300ms
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