I know I'm repeating myself, but I still remember back in the 70s when the HP-70s went on closeout. The price dropped so much (along with the others that were closing out at the time) that I remembered thinking I could start an HP collection, starting with the 70, which I assumed would be one of the harder ones to get later on, since I never knew anyone who'd buy one.
It was indeed pretty cheap, but since I was making about $600/month at the time, I really couldn't afford it.
Now, I see a 70 being bid up to $480 on its first day on eBay, and I have to wonder how many of my own footprints my butt is going to collect over the next week.
Yeah, yeah, inflation, opportunity cost, all those arguments. Still... I sure wish I'd got that 70 when I had the chance.