Finding donor sperm

Hello ladies 💕

So my partner and I have started looking into starting a family. She would like to carry first and we don't have any reason to believe we'd have fertility problems so we'd like to get pregnant at home. We're looking for a sperm donor who's mixed race (black/white) or black - light skinned, so that are children will look like both of us (I'm mixed race and she's white). But it's not proving easy!

Does anyone have any advice for finding sperm donors of specific ethnicities? We live in the UK but would happy to have a donor from anywhere.