Switched on Schoolhouse. I have 4th and 6th grade available separately. Each individually retail at $350+ if you want both I'll consider offers.
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This is an entire curriculum, core content along with Bible studies. The parent can create the pace as well as which topics are included. As you may know all their content moved to all digital (which meant it couldn't be used for multiple children or passed down year after year.) The company now is strictly Monarch and the annual cost is still well over $300.