They may sound the same, but there's a sizeable difference. The Great Courses Plus is a subscription service that has hundreds of the most current and most popular courses, from The Great Courses. The Great Courses Plus is an online streaming service that offers a membership, where The Great Courses is not a subscription service but offers all courses for individual purchase on DVD, CD, or Digital formats. They're two different sites and two different businesses Great Courses offers multiple ways to purchase courses. You can buy courses as an instant video to take the lessons wherever you go. Great Courses also provides the option to buy programs as a DVD. Select courses also come as instant audio, and you can even send classes as an e-gift. Great Courses Plus is a membership that gets you unlimited access to courses at a higher price. Each course has about 20 lectures on an average of 30 minutes each. You can get so much content within one single course