Butterfly koi is not very popular and I doubt it if you will find in Cape Town.
Why don't you pop in at the annual Western Cape koi show at Willowbridge tomorrow or Sunday?
I have quite a few baby platinum (ordinary/proper) koi for sale at the show bred by the world famous Platinum breeder, Chogoro.
E Mail: firstname.lastname@example.org ; http://www.koionline.co.za
Koi are not my whole life but make my life whole