I can tell you which ones not to get. Don't get the ones from Proaquatix. There are two stores in SoCal (Reef Lounge and Coral Gazers) that buy Proaquatix clowns including Onyx Picasso. I have never seen one without deformities. It's a shame a breeder would put out clowns like that through local fish stores.
Wish they either changed their brood stock and/or their breeding practices for the better.