And, at the lower end, HP also has a presence. The HP 32SII (discontinued, now $139 on ebay; originally sold for less than half that price) and the HP 35S (red

And, at the lower end, HP also has a presence. The HP 32SII (discontinued, now $139 on ebay; originally sold for less than half that price) and the HP 35S (redesigned version of the 33 which was the ugly successor to the 32SII) are non-graphing RPN machines that are very good for quick calculations. (My first and favorite HP, the 41, is much older than these, but it's too expensive to have one laying around everywhere I might need one.) Even if I'm in front of a computer, typing in to a console window, it's faster to turn on the calculator than to enter bc, python, or matlab and type in the calculation. And with RPN you get to see the intermediate results so you know you're not forgetting something.