If you exchange your SodaSteam or SodaKING 60L cylinder at United Petroleum you will receive one free SodaKING syrup with the choice of Creamy Soda, Lemonade or Cola.
It's not a bad deal considering Coles Express normally charge $19 for a SodaStream cylinder exchange.
Participating servos can be found on the page.
Piggy backing off Juan Pablo's deal on the SodaKing Windsor!