I couldn’t afford one (much les an HP). When Casio came out with a scientific calculator for (IIRC) $24.95, I was all over it. Still have it, and occasionally use it. I also still pull out the slide rule from time to time, so I can use it after civilization collapses.
About 10 years after getting my HP-25C I was gifted this Solar Powered Radio Shack Scientific Calculator, which I carried in my shirt pocket until retirement in 2013 (~30 years). I believe it originally cost somewhere around $20-25. It still works and has my final business card with it!
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, haha