I check the bins hoping for an RPN HP every time I hit the thrift stores. No luck yet, and until I finally make that score my daily is still going to be pCalc on my phone, but in the meantime I’ve picked up quite a few nice clean ‘70s and early-‘80s models for a few bucks each.

My two Radio Shack-rebadged Casios from high school (early-Reagan-era) also still work just fine. I think I’ve replaced the batteries on them maybe twice since they were new.