Join Children’s Book of the Month club to get 6 books for $2.00 plus a free gift. This does sign you up for a membership and you will need to buy 4 more book to fulfill your commitment. (Or you can buy 1 or 2 more at a discounted price right now so you don’t as many later.) Get all the details here.
I have done the Disney Movie Club and Cookbook club before and enjoyed it. If you watch the sales throughout the year, you can purchase the books/movies that you need to fulfill your commitment at a discounted price. And the introductory offer was a steal of a deal!