How do I buy music if I also have an Apple Music subscription?

I am using Apple Music (the app) on Catalina. I also have an Apple Music (the service) subscription.

Sometimes, I want to just use the Apple Music Service to add a track to my library, and I don't care if I actually own it in the sense of "still having it if I cancel Apple Music". But sometimes I do care, and so for those things, I'd like to buy them.

The problem is I only see the "Add To Library" + symbol, and don't seem to have any option to buy the track (ie, I never see the price button for the song or for the album).

Is there literally no way to buy music anymore if I've got an Apple Music subscription?