As kids, my mom used to send us to the corner store (literally the opposite corner). you Waited in line and when your turn came up you would ask for 1kg of sugar or whatever. If you forgot you had to wait on the side. The guy at the counter owned the store and he would go get you a Kg of sugar in a bag from a bigger sack or a barrel. He would weigh it for you. Then he would calculate how much it was based on his own price per kg.

Just saying, things could get a heck of a lot worse than having to ask the teller for condoms and a razor pack.