Affordable Adding Machine with Multiple Memory Banks for Professional Use

The user clearly has a critical need: "My job requires me to do thousands of calculations, and we need multiple memory banks. The ones that used to be available are either discontinued or way too expensive." They've even tried building one themselves. This is a strong signal for an unmet need in the market: a modern, reliable, and affordable adding machine with multiple memory banks, designed for professionals who handle high-volume calculations. It could boost productivity and accuracy for users in specific job roles, filling a clear gap left by discontinued or overly pricey options.