You can purchase prepay micro sims from $15 aust from several providers inc optus, big pond(Telstra) , vodaphone, 3 go to each website to check on rates on prepay also hot Spots are free in many restaurants like macdonalds and inner city malls pending what city you are visiting
Most hotels ,apartments etc offer wifi for a small charge
If you need more assistance send message in private and I will provide links. Let me know where you are visiting in aust. I am in Brisbane. By the way same applies to mobile phones with standard sim assuming your phone is unlocked. Other wise pick up a cheap unlocked phone and prepay card from $50
Australia also has iTunes store with different movies, music etc however you can still use your American iTunes store while in Australia . If you would like to access itunes Australia you can by purchasing Australian iTunes cards from $25 and set up an Aussie account. Try looking at the iTunes store by switching countries you will see what we have here. The only thing to remember is a international power adapter as it is different to American
Only thing missing is iBooks paid books as very limited.
Oh we speak a funny accent here lol.