Good price on this - saves $10 + over other places.
Amazon.com: HP 50g Graphing Calculator (F2229AA#ABA): Electronics
* New display upgrade--the new HP 50g display features a 30% increase in usable space over the HP 49g+
* New powerful SD card slot allows you to format your card right in the calculator and expand memory
* Massive 2.5 MB total memory--512 KB RAM plus 2 MB flash ROM for performing future upgrades**
* New larger equation library and 2300+ built-in functions--ideal for both professionals and students
* The choice of efficient RPN, Textbook or Algebraic data entry
HP 50g Graphing Calculator $98.99 at amazon 
