Vintage Casio FX-100 Super FX Scientific Calculator Hand Held Pocket | eBay
Amazon.com : Desktop Calculator Large LCD Display 12 Digit Number Handheld Portable Pocket Basic Calculator with Big Soft Sensitive Button, Battery and Solar Powered, for Office Home School Use(OS-6M) : Office Products
CASIO fx-1000 Scientific Calculator -I believe this one is highly collectible
More Matrices and Complex Numbers: Problem Solving using the Casio fx-991ES PLUS Calculator: Brown, Allen: 9781693869464: Amazon.com: Books
Casio calculator FX-1000F with owner's manual (nº57) – Casio 880
Casio OH-7000G Handheld Electronic Calculator | National Museum of American History