Agree with Jimi that quite possibly the most acceptable antonym for "free of demand" is "on the market." But, "purchased" or "priced" could get the job done as the alternative of "free of cost." This reserve is free of demand. This guide is priced. That dessert was free of demand. https://devinexmam.ampedpages.com/live-porn-cams-for-dummies-63604020