You made my heart stop for a minute there. I got through your easy and medium list without seeing the Carberryi and immediately thought I had made a mistake! I was so relieved to see they didn't show up on your hardest list, either!
Are these really that uncommon?
I dont think they are that uncommon, but their coloration isnt as dramatic as some of the other, similarly priced anthias (resplendents or bimacs). There's also not much in the way of sexual dimorphism, as some other anthias (like lyretails) have as well, so you get pretty but boring fish. Dispars look similar and are half the price, so if you can get 3 carberryi, you can get 6 dispars for the same money too.