It looks like there are almost 600 of The Great Courses on Audible. (I think you can get two of them without paying if you sign up for a free trial — then there are often specials that can drop the price down to USD $6.50 to $10 each.)
This page lists the available courses.
I wasn’t interested in audiobooks for a long time, but found that they are a good way to get in some extra reading while driving or walking. I speed up the playback to get through them more quickly. Sometimes the lecture-based format can be a good way to get a quick overview of a topic before diving in deeper with original sources.
If you don’t want to pay for audiobooks, there are also lectures from universities on YouTube and other platforms that are available to watch for free. Here are just a few examples:
If you’ve found any good ones, post a comment below.