In North Carolina beer and wine wholesalers are not allowed to give quantity discounts to retailers. Whether your local wine shop buys one case or 100 cases they, by law, have to pay the same per case price. When retailers offer a discount to their customers–like 15% off on a case–they are bearing the full cost of that reduction. It is not a volume discount that they are getting or legally can be getting from their wholesaler and passing on to their customers.