Okla. Stat. tit. 37A § 2-138
The holder of a mixed beverage, beer and wine, caterer, special event, public event or airline/railroad/commercial vessel beverage license shall purchase alcoholic beverages only from a licensed wine and spirits wholesaler or beer distributor, or as otherwise specifically provided by law; provided, the holder of a mixed beverage, beer and wine, caterer or special event license issued for an establishment which is also a restaurant may purchase wine produced at small farm wineries or beer produced at small breweries in this state directly from a winemaker or craft brewer as provided in Article XXVIIIA of the Oklahoma Constitution.
A wine and spirits wholesaler, beer distributor or a holder of a small brewer self-distribution license or brewpub self-distribution license may deliver such products to licensees authorized to sell alcoholic beverages for on-premises consumption; provided, such licensees may also pick up alcoholic beverage orders if they hold a private carrier license issued by the ABLE Commission.
Okla. Stat. tit. 37A, § 2-138