HP calculators just never die! I still have a HP-12C, and a HP-41CV, which both work perfectly well. Yes, you'd think that calculators dead with cellphones around, but if you are regularly calculating numbers it is often easier to still use a dedicated calculator.
There are apparently still enough calculator devotees for HP to resurrect a model that’s been kicking around for over 40 years as a “Collector’s Edition,” complete with a price tag that might have you doing a double take.
First released back in 1982, the HP-15C debuted when HP was still calling itself Hewlett-Packard. And they made really good quality calculators back then. Some even went into space as a backup to assist with critical calculations.
There is a lot of nostalgia around older HP calculators today still.
See
HP Is Selling a 40-Year-Old Calculator Again—For $120#
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HP15C 
The HP-15C is reborn with a collector's edition model and a jaw-dropping price tag.
