What about Math Mammoth for math? What about Beautiful Feet for history - you could cover a certain time period with books on his level and he will never know it. How about Writing with Ease, Writing Strands, Easy Writing, or Writing with Power - none of these come with a cd though. The only one I can think of that has a dvd plus work pages is Essentials in Writing - but he has grades on the covers of the DVD. I don't think the printed work pages if you print them out off the dvd. ,
We too have a child with DS, but she is only 9.