Turns out that "Zerboz" are wee little figurines--less than 1" high--of various characters that come single-packed inside plastic balls (seen above). For items this small I would normally assume you bought them via those vending machines stationed at the front of supermarkets and big box stores, but Rick tells me that he was able to handle each of them and, using skills more akin to The Ten-Eyed Man, was able to determine what figure was inside. Score one for Rick!
Actually, that's score at least three for Rick, because he generously sent me an Aquaman figure (above), plus another Aquaman that is entirely clear(?). As you can see, the detail isn't great, but there's only so much you can do when working on a piece this tiny.
Going by the label on the package, Aquaman is part of Series 2 of the Zerboz (Zerbi?), which is fairly shocking to me because as I said, I didn't know there was a Series 1!
Really cool find, thanks so much Rick!