Saw this on the Starbucks App. The original price was $9.
https://www.starbucks.co.nz/rewards
Terms & Conditions: Get any Tall Iced Shaken Espresso with Salted Caramel and Oat Milk or Brown Sugar and Oat Milk at $6. Any add-ons, upsize or customisation will incur an additional cost. Available from 1st–31st May, in-store and via Mobile Order & Pay. Starbucks reserves the right to change or withdraw this offer at any time.