I use SCM as my framework for our Bible,History, Geography but add in books from CMH for those subjects for my big readers. I use Charlotte Mason Help for most everything else. Yes, the high school components, which are no longer on the site, are CM all the way. Some managed to save the info from her site, but unfortunately it is no longer available.
The CMH site has a linked amazon store to a variety of books used and the SCM store sells those that they publish.