No trying to be funny, but I think every FOA collector is looking for the same figures. There used to be a guy that sold Jangutz Khan on eBay. I mean he had hundreds of them, and he would post a new one each week.
Yeah. There has been a lot of discussion in the MUSCLE community about the "Rule of Two", but the FOA community (being much smaller) experienced it sooner, and the effects were a lot more cartoonish, for common figures.
You'll typically find yourself paying $100's of dollars to get the figures you named in auctions, hidden in large lots. Ironically, it is probably cheaper to get the Italian Exogini variations, though you specified you wanted the US versions... You probably already knew that.
Wrath1104 is correct. Part of the problem is, we spend a lot of time bidding against each other, instead of working together, and the prices of FOA have exploded.