Got ahold of a Casio fx-991ex and CG-50 to match my Classpad II. I'm really impressed with them but there is something about the fx-991ex... (see comments) : r/calculators
Casio fx-991EX Classwiz for High School Students : Japanese Books - Amazon.co.jp
CASIO FX-991EX Classwiz Advanced Scientific Calculator - 552 Functions – In Deals We Trust