You can purchase a TI 84 Plus at your local electronics store, such as Best Buy. You can also purchase one online from a wholesale website such as Amazon.
Some of the features of the TI-83 Plus, are: upgradable operating system and software; preloaded apps; compatible with TI-84 Plus and TI-84 Plus Silver Edition.
One can purchase a TI 84 Plus Silver Edition from the following shops: Amazon, Calculators Direct, eBay, Walmart, Target, eBuyer, Staples, Best Buy, to name a few.
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You can download it from TI's website.
The TI 84 Plus Silver Edition has a replaceable cover which you can have a different color on. And it also has a larger capacity for memory.
Press the APPS button. You will see a list of all the applications that are currently on the TI-84 plus. Use the arrow keys to scroll down to the one you want to use and then press ENTER.
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The t1-84+ has the addition of a usb cable and preloaded apps.