Which company's graphing calculator has maintained essentially the same retail price point (~$100) for over 25 years, becoming notorious for its price stability despite technological advances?

In the world of mathematics education and tools, the graphing calculator represents one of the most significant retail product innovations of the last few decades. These powerful devices transformed how students learn complex mathematical concepts and how professionals approach calculations. But how well do you know the business and product history behind these mathematical powerhouses?

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Texas Instruments (TI-83/84 series)
Casio (fx-9750 series)
HP (HP Prime series)
Sharp (EL-9900 series)