$12
Casio fx-115MS. (Not a graphing calculator). $12.
Selling one as I have two of the same.
Model as seen in:
http://www.amazon.com/FX115-MS-SCIENTIFIC-CALCULATOR-BUILT-FUNCTIONS/dp/B001QJCR9Q/ref=sr_1_9?ie=UTF8&s=office-products&qid=1307493768&sr=8-9
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