There is a book called “Homeschool Your Child For Free” by LauraMaery Gold and Joan M. Zielinski available for $13.00 on Amazon and it is full of free sites for every subject. They aren’t necessarily CM, but you can adapt as much as possible.
Using the free guides here you can get a pretty good sense of what you need, where you are going and how to get there. This free ebook talks about it: http://simplycharlottemason.com/books/getting-started/
Check out this list for free resources:
http://simplycharlottemason.com/ – THE BEST homeschool method and site
http://www.geog.byu.edu/Assets/Maps/ free maps for geography and map drills
http://www.squidoo.com/cassatt-artist-study another awesome artist study
http://www.knowitall.org/instantreplay/content/LanguageIndex.cfm free foreign language lessons
http://www.myaudioschool.com/ – organized by history period lists of librivox.org’s public domain audio books and lots of extras
http://www.livingmath.net/ living math stuff
http://www.freetypinggame.net/ free typing class
http://www.multiplication.com/interactive_games.htm multiplication games
http://www.squidoo.com/drawingwithchildrennature free drawing lessons
http://www.preschoolexpress.com/alphabet_station.shtml alphabet and number and more activities
http://www.squidoo.com/harmony-fine-arts-mini-units picture and composer studies
http://momstoolbelt.com/moms-home-journal organizing your life and homeschool
http://cgfa.acropolisinc.com/index.html artists and their works
http://notebookingpages.com/ Free stuff, and then the membership was worth every cent!! Pages for every subject and style!! LOVE this.
http://pattyreedsdoll.blogspot.com/ American history
http://littlehouseteachersguides.blogspot.com/ Laura’s stuff
http://jcps.jefferson.k12.ky.us/AngelUploads/Files/garmstr1/themesandunits.htm free games, activities, flashcards, and theme units
http://www.the-athenaeum.org/art/by_artist.php?Artist_ID=535 Eastman Johnson artwork
http://etc.usf.edu/clipart/sitemap/sitemap.php Free timeline figures – awesome!
http://www.heritage-history.com/www/heritage.php – fabulous living history books
http://handbookofnaturestudy.blogspot.com/p/summer-nature-study-outdoor-hour.html there are others too, and it can be free or purchased.
Hope this helps.