Thankfully Blackboard also offers CourseSites which is a free version very similar to Blackboard that individual teachers can use. So if your district doesn't offer an online platform or the district has cut funding for it, CourseSites can come to the rescue.
CourseSites is very similar to Blackboard, though the look of it is a little different. Since it is not a district wide platform you will have to invite and administer the students yourself which does add a certain level of responsibility. You still have the function of creating tests, surveys, discussion boards, blogs, etc. CourseSites also allows you to integrate published texts and their ancillaries at a certain cost.