I’m another one of those people who regret selling/ giving away the few of them I used to own. They were cool little gadgets (the early ones more so than the later ones) but they were piling up and were so easy to find at thrift shops at the time that I figured I’d just get some more when I needed them. The going rate was between $5 and $25 back then and they were usually in the toy section. Within a year or so of me letting them go the prices went nuts. Familiar story.
I’m curious to see which version this takes after (if any) and how much it goes for.