I'm a huge fan of The Great Courses; have been from a young age, back when it was The Teaching Company. My podcast series is inspired after their structure, which I only created because (a) back then TGC:ML didn't exist; (b) to provide something free - TGC is quite expensive. Now with TGC:ML out, MLG & TGC:ML effectively scratch the same itch. You could choose one or the other, or both, depending on your budget / time.

As I said, TGC can be quite expensive. Here are ways to find it cheaper:

1. Check your library. That's how I used to get their courses.
2. If it's an audio course (like TGC:Consciousness), check Audible first. TGC posts their audio courses to Audible for much cheaper than their website.
3. If you plan on using TGC often, subscribe to their Plus service. First ensure all the courses you want are in the Plus service (not full parity, last I checked).
4. If you use Plus or just buy a course, check all the coupon sites like RetailMeNot or Honey. TGC, like Udemy, is super coupon-heavy. The "original" price may in fact be one of those time-pressure sales bits, with the discount prices being the intended revenue.