What about Super Charged Science with Aurora Lipper?
Your child works through whichever of the topics they choose at their own pace and the online live classes are optional as and when the topic grabs your interest.
You can always e-mail for help and suggestions on anything you are working on.
I have just received a mini-package that I ordered from them (3 x dvd's) with Magnetism (23 lessons) electricity (26 lessons) and energy 1 (33 lessons). So far we are impressed!
And if these work well for us this year, we will be getting the full program from next year on.