I belong to 120 person food co-op. Its operated out of the basement of house since the 80s. We're a different model than described here, its a hybrid of a buy

I belong to 120 person food co-op. Its operated out of the basement of house since the 80s. We're a different model than described here, its a hybrid of a buying club and a grocery store. All of the labor is unpaid, you must be a member to shop, it has limited official open hours but everyone gets a key and can shop themselves whenever they like. Most people pay a 20% markup on goods but people that have extra responsibility pay less.