What is the rarest chicken in the world?

Before I decided to give up my incubators, I was looking at Ayam Cerami eggs - very rare at £60 for six. Apparently it's the only chicken that is completely black - eyes, comb, wattle, beak, feet etc. It even has black flesh and blood so dark as to appear black. They are highly prized in Asia where they are used in religious ceremonies - you can virtually name your price if you have a cock bird that is true to form and all black.

Yes ANHBUC - but I need to learn to spell! 

I tend to "collect" odd and rare breeds (as well as my "ordinary" girls - though to call them that isn't fair) and really fancied this breed, but the £60 price tag was a little too much.

It's a Goth chicken