Yeah Papa, tell me about it.
Just picked up 5 of the small ones at 50 cents each (and quite a few other Star Wars droids) to convert up for my 20mm games.
The small ones should be nice for 28mm as well, I reckon. They fit nicely on a small 40mm round base. I can take a comparison pic next to a Marine if you want.
(Might I also add I'm starting find shipping prices from the USA really odd these days? 8.80 dollar for 20 mini's I paid, while another charges me 18 to 38 dollars for just 1......)
Johan