Live aquaria has them listed as both names and go for $60 for medium size.My guess knowing neptunes is they have them labeled correct and they are true percs. Even if your torn on what they are its a black and white clown that go for $40-60 as a medium size. These were black and white when juvenile and had orange faces the black and white ocellaris I have seen are orange as juvenile and turn black and white.
"The Black and White Ocellaris Clownfish, also known as the Black Perc, Black Percula Clown Anemonefish, or Black and White False Percula Clown and is normally found in association with anemones on the reefs of the Coral Sea. It can be found individually, or more commonly, in pairs or small groups within the same anemone such asHeteractis magnifica or Stichodactyla mertensii. These tank bred clownfish grow to a maximum size of 3 inches in the aquarium, and may be kept singly or in groups."