This varies incredibly from family to family. You can ask, "What do YOU spend to homeschool?" and get some better answers that way. I think we are spending around $1000/year for our oldest, but it will work out to less for our second daughter because we have more on the shelf to pull from for her :). We live rurally so our library is tiny, we have to buy everything for the most part. That being said, I do buy used whenever possible. We also like to buy a lot of books to read together and individually. That bumps the price up quite a bit. I think textbooks are cheaper generally, but I can't get into them for content subjects, I much prefer to teach those from a spine and living books.