I know of one at turbosquid - by toucan - for $30. not actually poseable, but comes with enough data to make it so. it ain't got any koi textures, and the one-sided flat mapping sux IMVHO. I retextured their free version, but have been too lazy to poserise it. nor can I figger out how to redistribute it, due to the fact that the free version comes as a 3ds file, and it hasta be unwrapped and remapped.