Listmania!
The best Graphing Calculators
By an Amazon.com customer
Texas Instruments TI-82 Graphing CalculatorTexas Instruments TI-82 Graphing Calculator
Buy new: $151.99 / Used from: $29.99
A REALLY cheap calculator, good for basic algebra, I own one.
Texas Instruments TI-83-Plus Silver EditionTexas Instruments TI-83-Plus Silver Edition
Buy new: $299.99 / Used from: $68.99
Also good for algebra, but more advanced than the 82.
Texas Instruments TI86 Graphing CalculatorTexas Instruments TI86 Graphing Calculator
Buy new: $129.95 / Used from: $36.99
Getting better, lots of downloads and a better interface than the 83.
Texas Instruments TI-89 Advanced Graphing CalculatorTexas Instruments TI-89 Advanced Graphing Calculator by Unknown
Buy used from: $60.00
Now this is probably your best value, with great graphics!
Texas Instruments TI-92 Plus Graphing CalculatorTexas Instruments TI-92 Plus Graphing Calculator
Buy used from: $50.00
Whoa! If I could accually afford this baby, it would be mine in a second!
Texas Instruments Voyage 200 CalculatorTexas Instruments Voyage 200 Calculator
Buy new: $179.91 / Used from: $100.00
This is the best of the best, a black and white PC in all respects!
HP HP49G Graphing CalculatorHP HP49G Graphing Calculator
Buy used from: $43.00
Great calc, but if you can afford this bad boy, better to go with a Voyage 200. That is, unless you want an HP.