Hello Sonny_Black86,

The Tale of Adventure potions can be purchased on the Mogstation. Just be aware that the Job boost (used to level your character to 60) and the Story skip (used to skip the Main Scenario Quests) are purchased separately, so if you want to jump ahead in the story and level your character, you must purchase both.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!