This just hit me! Grocery stores run completely on vending machines. Maybe implement a new type of vending machine that is cheaper to make and thus cheaper to purchase. You could cut down on labor costs by only needing to hire people to restock (probably overnight).
It'd be more convenient for people as it would cut down on checkout lines plus you could reduce your prices since you have to pay less in labor. Also more convenient in this world where people don't want to have to interact with other people. i.e. talking to the cashier.
You'd want machines that run only on credit because ain't nobody got time to count coins. Let me know what you think!