Selling a book on Blackboard
I don't think you can post it through BlackBoard, but you can sell it online thru student life.
Go to the student services page: http://www.matc.edu/student_services/index.cfm
and scroll down to Student Life and on the right, there is a link to the textbook selling form
otherwise, you can check with Student Life and they may be able to also post it on their Textbooks for Sale Bulletin Board as well.