563.065 Price differentials.—Nothing in the Beverage Law shall prohibit licensed distributors of malt beverages from charging different malt beverage prices according to county, according to the branch of a distributor’s parent place of business, according to whether a vendor sells malt beverages on premises or off premises, or according to quantity sold, as long as the price differentials are filed in advance with the Department of Business and Professional Regulation as provided by rule.