I'm not really surprised, I live in Canada and I've only ever found one or two of these. Except for when I was a kid and saw a whole endcap of end run BH figures for a buck, sigh....
It'd be funny if your toy store photo search uncovered a pic of dozens of carded Humanoids on an endcap.
As for grading, I don't get it personally. Many would likely tell you how great it is but i've never been able to get my head around it.
I like to feel & smell the vintage toy, as well as see it. Encased in acrylic doesn't do it for me. And don't get me started on grading comic books...