My Quora question :
I can buy a pocket calculator for less than a pound. Why can't I buy a generic equivalent of a 90s Palm Pilot for ten pounds?
Answers on the Quora site (see link above)
Also discussed on CheapComputers
PocketCHIP was a $10 GnuLinux single board computer.
I had one, but it was also stolen.
There are now graphing calculators that speak PythonLanguage
More : my Quora answer here : https://www.quora.com/What-do-you-think-computers-will-be-like-in-10-years/answer/Phil-Jones is now on CheapComputers