I have a koi male and gold female pair for sale. They are proven breeders with viable eggs.
Here is the female fanning her eggs on the top part of the slate:
A picture of some of their fry from the last batch:
The male:
The male and female taking care of their eggs:
I'd want $50 for them and I'll even throw in a few of their last batch of fry which are near a dime body size.