The Great Books Foundation has updated their list of free educational materials available to request. Currently, there are 25 titles on the list for grades 1 - high school.
This is a great resource for homeschoolers. You do have to sign up for an account, but you will not be required to enter any kind of credit card information for the free materials.
Even the shipping is free! Go here to view the full list and to sign up for an account if you see materials that would be of use to you and your family.