As a way of stimulating conversation about the pay equity gap, this pop up shop in Pittsburgh has two price tags on its merchandise; one for women and one for men. For every dollar the men pay, the women pay 24 cents less.
ETA; for everyone saying that how can they get away with this, is it legal, sustainable; please keep in mind that women are charged more than men for many services; haircuts, for example. So this kind of gender specific pricing already exists but favours men.
ETA: commenter aloe-vera has provided this link;