Maeser Academy ***** (five stars)
An excellent, accredited, and challenging K-12 online school which meets national standards, yet gives families the flexibility to customize the program to meet a child's individual needs. http://www.maeseracademy.com/
Saxon Math *****
Saxon Math is a program with a long-standing and proven track record in providing a full-spectrum math education for grades K-12. This incremental program also caters to home school families. You can purchse directly from their site, or you can go to eBay and find many new and used editions there at a reduced price.
http://saxonpublishers.hmhco.com/en/saxonpublishers.htm
Spalding: The Writing Road To Reading *****
I LOVE this program! It's the most comprehensive and thorough phonics program I have ever seen. It not only teaches phonics, but also spelling and manuscript handwriting. It takes a little bit of effort to become familiar with the program, but worth the time. It is by far the best foundation available to give your child the necessary reading and writing skills.
http://www.spalding.org/index.php?tname=program
Happy Phonics *****
Happy Phonics is similar to the approach of Spalding, but is easier to pick up and use right away. The woman who wrote the program, Diane Hopkins, is a veteran homeschool mom who has spent years in the trenches and knows what works.
http://www.ldfr.com/catalog/product/0707301