That's a fair option for those who come and stay in the country for a long time. You have time to browse local providers' offers, choose the most beneficial package and use it until it expires. The local SIM card is one of the best options for cheap Internet in Australia and Oceania. But if you move between countries, you have to get a dozen of SIM cards. Doesn't seem practical.

Home providers offer a bunch of options to go online in Australia and Oceania, but all of them are pricey. If you are always online on trips to Australia and Oceania, you can easily spend a ton of money. An advantage: no need to change the SIM card, which means your current number is be available. However, incoming and outgoing calls are also expensive. Internet roaming in Australia and Oceania is an option for lucky ones who don't count money.

Public hotspots in Australia and Oceania are not so common and have a complicated access. Most often, to get the access you need SMS authorization. This is the cheapest source of the Internet in Australia and Oceania (as it's free), but not the most convenient (as you have to stay in Wi-Fi zone). It's fine though, if you plan to spend the whole vacation in the hotel.

Vodafone, Saunalahti, Elisa, Telefonica, Orange, Cellhire provide Internet in Australia and Oceania at relatively low prices. You buy a local SIM card, connect the data package and use it until it expires. However, when moving between countries, the Internet in Australia and Oceania works in roaming. Thus, to save money, you will have to buy a new SIM card in each country.