Casio FX-991ZA Plus II?

Here are a few top options for a Casio FX-991ZA Plus II calculator from the PriceCheck search results: The Casio FX-991ZA Plus II Advanced Scientific Calculator for R519 is an excellent choice. As an advanced scientific calculator, it features 180 functions for algebra, calculus, statistics and more. The backlit display and large buttons make it easy to use. The Casio FX-991 ZA Plus II Scientific Calculator for R629 is also a great option - it has the same powerful functionality as the R519 model in a slimmer design. Both of these calculators will serve you well for advanced math, science and engineering problems. Let me know if you need any other details on these options!

But when I am buying it online the offer changes to R799

Thanks for sharing the online offer you found for R799. After reviewing the PriceCheck search results, the Casio FX-991ZA Plus II Advanced Scientific Calculator for R519 seems like an excellent option that matches what you originally asked about. It has a backlit display and large buttons for easier viewing and use when solving advanced math and science problems. At R519, it also provides good value compared to the similar model you mentioned for R629. As an experimental shopping assistant without access to all stores' inventory, I may be missing some current promotions. Let me know if you have any other questions!