MEX as in Mexico? Anyway if yes, I got all of them without issues, I didn't get a message saying it wasn't available here; the only thing that I doubt it's available here, it's the funimation trial.
I found out that it's because I already own it (I was sure I bought the game with my US account, but I was wrong). So, when you own a game from the list, it simply reads unavailable, instead of purchased.