Thanks mellis1664!
Some of these I knew, others were new. I prefer European vendors (due to postage and customs), but there were some sets I'd really like to get my hands on!
If I had gone with 28mm, I would have bought miniatures from Artizan/Copplestone Kiss Kiss Bang Bang, but I want to use my 15mm terrain (and a group of purple-clad, jackbooted minions might work well in my sci-fi project as well).
I've been thinking about using Security/cops from GZG, since they all have jumpsuits and caps, but I'd love to have something even more in line with the octopus minions in the third picture.