Texas Instruments TI-86 Graphing Calculator calculator in excellent condition. Extremely helpful for Math 50 series, many engineering classes, Econ 50 Series and exams. Costs $130 new, selling for $65.

This calculator is superior (more ram, more pixels, same processor) to the TI-83 and the Ti 83+ (plus) as you can compare here:

https://en.wikipedia.org/wiki/Comparison_of_Texas_Instruments_graphing_calculators