Most dealers that I've experienced won't be able to tell most anthias apart. That said, I swear I saw three or four at my LFS in LA lately, so the timing of this post is rather amusing. I'm going back in two days. They definitely caught my eye; it was a red/magenta morph but had the P.olivaceus tail and body structure.
Well, those Anthias aren't Olives. They're just as cool though: an undescribed species from Tonga and Guam that is photographed in Scott Michael's book (need to look up page number ... it's identified as Pseudoanthias sp.4 undescribed). I really want to get it, but I already have plenty of Anthias and I don't really trust my LFS's water; I have no QT tank right now due to something being broken/leaking.