Looks like we have a fourth Chrome Bust -- C-3PO.
"A rather surprised Rebelscum reader Keith Smith sends along this image of his new Chrome Edition C-3PO mini bust from MBNA. Keith received the bust in lieu of the chrome Jango Fett bust he had originally requested. While we've been able to confirm that this is indeed a genuine Gentle Giant piece, there’s still no word from MBNA regarding how they plan to distribute it."
This image from RS: