FWIW, I work helping the non-profit site www.thegivingmachine.co.uk. We give 2.25% of purchases tracked through our site from Amazon (plus some other retailers)

FWIW, I work helping the non-profit site www.thegivingmachine.co.uk. We give 2.25% of purchases tracked through our site from Amazon (plus some other retailers). We also have a lot of other merchants signed up.