I have never heard of something like that. You’ll probably have to buy a standard microSD card. As far as I can imagine, most of the work in an SD card is done by machines though so that shouldn’t be too much of a problem fair-wage wise.
EDIT: If you want to buy a most sustainable SD/microSD card choose the one with the lightest packaging and buy it in a local store so the environmental impact of you purchase stays as low as possible.