More than ten years ago an online petition was started to Bring Back the HP-15C. Tens of thousands signed that petition, but HP still won't bring it back into general production.
In 2011 SwissMicros started production of a credit-card sized clone of the HP-15C and some of the other models.
Now in 2015 SwissMicros has released a full-sized clone of the HP-15C and HP-16C as well as of the HP-41CX, fully functional, with real buttons just like the HP calculators and even more features, with high quality materials and finishing.
The calcualtors emulate the original HP ROMs, but alternative ROMs with extended memory capabilities can be user-installed using an USB cable.
Could be the perfect Christmas gift for the nerd who has everything! Go to https://www.swissmicros.com/