Why is the TI-89 more expensive than the TI-89 Titanium on Amazon?

[Embison]

How come the 89 is more expensive than the 89 Titanium on Amazon?

https://www.amazon.com/dp/B0001EMLZ2/?tag=pfamazon01-20

https://www.amazon.com/dp/B00000JF55/?tag=pfamazon01-20

Isnt the Titanium a lot better??

Are there a lot of differences between the 89 models and the Ti 83? Are the differences only memory size?

thanx to anyone who can help answer my questions..thank you!

 

[OrbitalPower]

Amazon often has sales and sometimes you can get a better product for cheaper.

Corporations do do this, you know. For example, at McDonald's I can get a 99cent extra large soda for cheaper than I can get a medium, 1.29, I believe.

Looks like a good time to buy a ti-89, and yes it's better than both those other two calculators. It's been a good one in my experience, however, I want to get a RPN program for it.

 

[vociferous]

The TI-89 has what is called a computer algebra system or CAS, which can locate symbolic solutions to problems, like finding derivatives, integrals, and whether or not infinite series converge.

The TI-83 can only find numerical solutions to problems, like the roots of polynomials and the coefficients of systems of linear equations.

And I have no idea why the older version of the TI-89 is more expensive.