I used to collect HP calculators in a big way. Then I stopped. I still use a HP-11C for daily work, a real physical calculator I bought brand new in Singapore about 25 years ago. I also use the RLM iPhone apps that emulate a HP-11C. I still love HP calculators, but I no longer own 50 of them. I just have a few left.
I saw today in Cool Tools details of a WP-34S calculator. You can buy a kit to make your own, or you can spend $75 and have someone make it up for you. It looks like they buy a real HP-30B, open it up, solder in some extra components, then flash it with new ROM. You get a real physical HP calculator with the fabulous keys, but you get an open-source version of the software that drives it.
Only $75. Must think about this.
My HP-11C is now very old. It won't last forever. This new calculator could probably last me another 25 years, so it could probably "see me out" as I've heard the Scottish describe it.