If you don't own the game yet, the "Legendary Edition" often bundles the base game and almost all DLC for a fraction of the individual cost. Conclusion
If the price is the main concern, there are safe and legal ways to get the DLC at a heavy discount: dragon ball z kakarot dlc unlockercodex link
If you’re on Xbox, DBZ: Kakarot is often on Game Pass. The DLC isn't free, but the base game being free lowers the total cost. PS Plus Extra has also featured the game periodically. If you don't own the game yet, the
Buy only what you need. If you only want Bardock, buy that standalone DLC. buy that standalone DLC.