I have written a post about free homeschool printables and how you can homeschool your child for free. Just because something is free doesn't mean it is less valuable that something that you buy. Much of the concept of homeschooling for free is finding books and curriculum used and then reselling it when you are done with it.
There are so many free printable products out there, but sometimes it's hard to find an organized source. It's fun to make free printables. Many bloggers and companies make free items to get more readers to their site so that they can show them the other items that they have for sale. Seeing a company's free items can help you decide whether you like their style and resources.
You can read all about the free homeschool printables that I have found along with quite a few extra free resources.