Package stores licensed under the Oklahoma Alcoholic Beverage Control Act may sell only alcoholic beverages in retail containers as defined in section 4-2-1 of this chapter, in the original package for consumption off the premises. All retail sales shall be made on the licensed premises and all deliveries off the premises, at retail, of intoxicating liquor or beer are hereby prohibited. Provided, a holder of a retail spirits license shall be permitted to sell at retail any item that may be purchased at a grocery store or convenience store, as defined by law, except for motor fuel, so long as the sale of items other than alcoholic beverages do not comprise more than twenty percent (20%) of the holder's monthly sales. (2019 Code)