[SA] Any Sized Boost Drink $4 @ Rundle Mall, City Cross or Myer Centre

Just saw this on Facebook:

STOP your plans immediately!! ✋ Our Spring makeover in Rundle Mall is complete, and to celebrate our Grand Re-Opening, you can get BOOST (at ANY size!)* for just $4 at our Rundle Mall, City Cross and Myer Centre stores on Friday, Sept 7th! 😊

*From 9am-5pm only on September 7, 2018. $4 drink is valid for any size Boost at Rundle Mall, City Cross and Myer Centre stores. Excludes juices. All additions or alterations 60c extra.