I see them quite regularly,i havent got any yet because if im gonna fork out up to £70 per fish i want them to have a chance at breeding and i dont have the room to set up a seperate tank for them at the moment.
Yeah i have seen them anywhere from 50 to 100 bucks. I would only put them somewhere where i could breed them and be assured no other fish would harm em.
My m8 knew a guy who was breeding them. Showed me a tank pic about 30 of them! Looked amazing. He made a sort of staggering/tapered wall where the pairs setup home in little caves.