Amazon.com: Casio FX 991 ES Plus Calculator : Office Products
Amazon.com : Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural : Office Products
Casio FX 260 SOLAR II Scientific Calculator - 144 Functions - Easy-to-read Display - 10 Digits - Solar Powered - 5" x 0.6" x 2.9" - Black - 1 Each - Walmart.com
My Casio calc has been used so much that the button ink has faded. Those of you who own Casio calcs know their ink never fades. : r/Wellworn