For the month of May, you can find out for free through an arrangement that Homeschool Buyers Co-op has made with Learning Success Institute. Click here for more info.
I love the Homeschool Buyers Co-op. They always have good deals on homeschool curriculum, on-line programs, materials (like the Lego science kits), etc... Deals change throughout the year. I've been a member for several years now.
One more nice thing about the Homeschool Buyers Co-op is that you can get homeschool student and teacher IDs through them. They are free if you print them out yourself (I laminate ours) or, for a small charge, they'll make up a credit card style one for you.
I don't get anything for posting this, I just really like them & wanted to share.