Black Flats

Low: https://www2.hm.com/en_us/productpage.0892260001.html?ef_id=CjwKCAjwybyJBhBwEiwAvz4G7w7pJBVe0udphseg45S2TEZ1MRH9A9gmP_rLI0ER-QoX8AMgzKgyuhoCvKoQAvD_BwE:G:s&s_kwcid=AL!860!3!509002768507!!!g!1408650844702!&gclid=CjwKCAjwybyJBhBwEiwAvz4G7w7pJBVe0udphseg45S2TEZ1MRH9A9gmP_rLI0ER-QoX8AMgzKgyuhoCvKoQAvD_BwE ( H&M)

Mid-Range: https://www.dsw.com/en/us/product/zodiac-hill-flat/492681?activeColor=001&cm_mmc=CSE-_-GPS-_-G_Shopping_Flats-_-New_Flats&cadevice=c&gclid=CjwKCAjwybyJBhBwEiwAvz4G70OkQMyReL3mmbtr58_r6b6X64-uUWWi2HYHiBFkheUeE2ibEDdDIRoCEkQQAvD_BwE&gclsrc=aw.ds ( DSW)

High: https://ninewest.com/products/alena-square-toe-flats-in-black-leather?utm_medium=pla&utm_source=google&utm_campaign=freeshopping (Nine West)

Sustainable: https://www.zouxou.com/shop/glove-flat-in-black-glaze (Zou Xou)