Well, really it's not so much a question of finding one, as finding one that is ACTUALLY, obviously Blue. The last one I bought off eBay, which I have to ship back tomorrow, looked blue in the photo but when I got it it was the same shade of purple as the one I had. (Seller SWEARS it is really the blue one)
I don't know what to think, honestly. I mean, I can tell purple from blue, the pics from JediJman look obvious enough to me. Compounding my uncertainty is some speculation I have read online that this is not a true variant, but a simple color degradation of the soft goods over time. I'm not sure I buy that, but it does make me wonder.
I'm likely going to try picking up another one this week or next; maybe I will have better luck.
RE: Klaatu: yeah, the mix and match limbs seem to be the more common of the variants for this fig. I actually want one with ALL tan limbs, which I have a line on but haven't pulled the trigger yet. (soon)