I recently rented Physiology, An Integrated Approach and I was looking online because I have to also get the A&P access code and realize I could have rented it too with my book. Is there any way of pay the difference of $34 dollars and get the An Integrated Approach Plus MasteringA&P with eText -- Access Card Package instead of just the textbook? Or would I have to return it and re-rent the other book?