His very last album before he died was "All Eyez on Me" the rest was posthumous but the album "The Don Killuminati: The 7 Day Theory" was released after he died, yet they don't count it as posthumous.

The song was originally released by Tupac under the stage name Makavelli. It was a track included on the Don Killuminati Seven Day Theory.

killuminati

1. 2Pacalypse Now
2. Me Against The World
3. Better Dayz
4. Loyal To The Game
5. Pac's Life pt.1: Thug
6. Pac's Life pt.2: Life
7. Still I Rise
8. The Don Killuminati: The 7 Day Theory
9. The Passion Of Tupac
10. Best Of Tupac

I want to say over 5,000,000 (five million) world wide. All Eyez on Me was his best album and I think it was his best seller. But Pac always had good albums that always either go platinum or gold.