checkout swissmicros.com They make several functionally close HP calculators. Its a rather interesting approach and unless HP itself resurrects the OLD calculator line, these are close as you can get to a new HP calculator.

There is still the HP Prime.

Thanks! I was looking for an RPN calculator last month, and all I could find was the HP-12C. This calculator seems to be missing the x<->y key though. What's up with that? Without a swap x and y, the stack is a lot less valuable.

of course this key is there!

bonus: if you are on U*x xcalc can be used in rpn mode: " xcalc -rpn "