Casio fx-991ES Plus Scientific Calculator - Walmart.com
Casio FX-991ES Plus Scientific Calculator Fx 991 Es - New & Sealed ship to world wide : Office Products - Amazon.com
Amazon.com : Upgraded 991ES Plus Scientific Calculator, ROATEE Professional 3-Line Display Scientific Calculators with Erasable LCD Writing Tablet, Solar Battery Power,Desktop Calculator with Notepad for School : Office Products