You might want to try recreating Starbucks' pumpkin spice drinks at home, but the chain's pumpkin spice syrup is a particular seasonal favorite that cannot be purchased at all.
While you can sometimes buy Starbucks syrups from your favorite branch, they aren't always available. In fact, a staff member can lose their job for selling the syrup to you.
You can find dupes of Starbucks syrups and flavors online or make your own pumpkin spice flavoring, but these products may not be the same recipes your favorite baristas use.