and a lot of states:http://www.costco.com/Warehouse/WarehouseList.aspx
But does not say who has booze.
Some locations have liquor stores, often kept separate from the main warehouse in order to comply with liquor license restrictions. In some states (such as Texas), the liquor store must be owned and operated by a separate company with separate employees. In 2006, Costco lost a lawsuit against the state of Washington in which it was seeking to purchase wine directly from the producer, bypassing the state retail monopoly. In Australia, Costco has to comply with regulations set by each state they choose trade in; their first store in the state of Victoria benefits from some of the most liberal alcohol licensing laws in the country, with retailers permitted to sell alcohol on shelves within the store, in a manner similar to most European countries, yet they have chosen to have a separate checkout within the liquor section