I have an unopened, unused, completely new TI-36X calculator, selling for $18. I accidentally bought this calculator on Amazon, so I don't need it. This calculator is non-programmable but can also do calculus functions, so it's great for standardized tests or for using in classes that don't allow calculators like the TI-83,84,89,etc.

http://www.amazon.com/Texas-Instruments-Engineering-Scientific-Calculator/dp/B004NBZB2Y

It's currently selling for $20 on amazon, and its non-sale price is usually $25, so this is a great deal @ $18.

Pickup in Mountain View, cash only please.