Nangs are the slang name for nitrous oxide cream chargers. In Australia, Nangs can be purchased from various online cream charger shops such as Cream Charger Warehouse or Cream Charger World. You can even get fast delivery from services like Creamsta in Melbourne.
Nangs (Whip cream chargers) can cost from as low as about $40 to $60 for a pack of 50 depending on the brand and the seller. Nangs are used to whip cream with a whipped cream dispenser.