Referrer and referee get free delivery (worth $5).
I have seen this mentioned in other posts, but I think it deserves a standalone post. $10 to swap your empty Billy Bubbles cylinder for a full one $20 to trade another brand (Sodastream/SodaKing) …
![[VIC] Billy Bubbles Soda Gas Refills $10 + $5 Delivery or Free C&C (Fitzroy) @ Billy Bubbles](https://files.ozbargain.com.au/n/64/833064.jpg?h=40c7e5af)