Agree with Jimi that probably the most appropriate antonym for "free of demand" is "available for purchase." But, "purchased" or "priced" could operate as the opposite of "free of charge." This e-book is free of charge. This e-book is priced. That dessert was free of cost. That dessert was acquired. https://manuelpbkry.aioblogs.com/89452272/about-google-backlinks