Thanks for asking, everyone. We encourage you to use sites and groups already set up for buying and selling curriculum, particularly the CMcurricula group, since it is geared toward CM style items. Another possibility might be Homeschool Classifieds. Our heart is to keep this forum a place for encouraging discussion, rather than buying and selling.
That said, we aren’t going to kick you off if you are a regular contributor to the discussions and happen to post an item for sale every once in a while, but please try to use the PM feature in those transactions as much as possible so as not to clutter the main forum pages.