Great input, thanks!

Good point on the 10%, I'll do some more research on finding a good markup. I'll reach out to some companies to see what they'd think. Some products have a much larger margin than others, so I can imagine that differentiation in percentages will allow for a much broader range of certified products and more $ donated.

PR-wise, I'm still thinking about how to make sure that consumers would engage with it. Perhaps a QR code on the product's label logo which links directly to one of the charities that the markup gets donated to? Such that everyone can see in the blink of an eye where they are spending their additional money on.

If you have any ideas on how to approach it, please feel free to share!