'The popcorn comes at a value', 'The popcorn isn't free', 'The popcorn Expense $ten', 'You must pay for the popcorn' or, only, 'The popcorn just isn't free'. The statement, 'You normally takes your newborn around the flight free of cost' might be in opposition to 'You must pay back to take your child on the aircraft' or 'It's not free', or informal