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Have you looked at Switched On Schoolhouse, it's on the computer.
My son has taken College Algebra (now called Algebra II) from Thinkwell and is now taking their Trigonometry. The courses are amazing and he adores his instructor, Dr. Edward Burger (we have other Burger lectures and books).
The Homeschool Buyers Co-op, which is free to join, will be having a 50% off sale for Thinkwell next week. Don't miss this opportunity!
I purchased Calculus AB from the last group buy they had and will activate it in the fall when my son is ready for it. It's nice how you can wait to do so.