There are legal slot machines in Australia, but they are not common. In most cases, the only place you will find slots is at a casino.
There are a few state-owned casinos that offer slots, but most operate through the use of third-party providers.
There are some bans on slot machines in some states, but these bans do not always apply to all types of slots. In New South Wales for example, there are bans on video poker machines and fruit machines, but not on traditional slot machines.
There are legal slot machines in Australia, but they are not common.