If you follow my book reviews over on my website, you may have noticed several reviews for Great Courses lecture series. Each course is 12-48 lectures, on DVD, accompanied by a coursebook. These make great watching while, say, eating lunch. We wait until interesting courses are on special offer, and have watched many of these, from science and economics to literature and history.
Recently, Great Courses decided to discontinue several of their DVDs, leaving only streaming options. We dislike this, so have bought up a load of cheap courses while they are still available. These should last us a while!