Agree with Jimi that essentially the most ideal antonym for "free of cost" is "for sale." But, "obtained" or "priced" could work as the opposite of "free of demand." This book is free of demand. This book is priced. That dessert was free of cost. That dessert was ordered. Except https://cruzlmllm.educationalimpactblog.com/58176758/the-hairy-pussy-diaries