Walmart and Amazon have this Texas Instruments TI-84 Plus Graphing Calculator for the lowest price of $88 (reg. $114.88). Plus, get FREE shipping when ordering from either sites!
The all-purpose TI-84 Plus graphing calculator, ideal for math and science, features more than a dozen preloaded apps including functionality that encourages exploration of interactive geometry, inequality graphing, and real-world data collection and analysis. Ideal for middle school through college.