How can I get the best price to go from Santiago (Chile) to Aukland (N-Z), stay two months there, then fly to Bali (Indonesia), stay one month and finally fly to Europe?
Is it better to buy a normal or a RTW ticket?
And, where is the best place to buy a cheap RTW ticket?
Thanks for your help.

With OneWorld Explorer RTW tickets you buy them where you start the first flight. You cannot for example buy the ticket in CAI and have the first flight from SCL

You can do this using a Oneworld Explorer as a four continent RTW, with a basic routing such as:

SCL-AKL-HKG-DPS-HKG-FRA-SCL

You would be able to add four segments in South America, Europe and Oceania and two additional segements in Asia if you were so inclined.

At the moment, the cheapest place to start a RTW is Egypt, which, if you live in Chile (and I am jealous of you if you do!), would be a long and presumably expensive trip. The problem with starting in Chile is that fares are the same as starting in the USA, which is one of, if not the most expensive, place to start a RTW.

You might also consider the Oneworld Global Explorer, which is a mileage based ticket and may be cheaper for the itinerary you are proposing.

Thanks for your help but I have some more questions.
- How can I purchase a RTW in CAI? I have to go there or I can contact somebody there from my country? And who can I contact?
- If I have to go to Cairo, where can I buy it?
Thanks

You might try reading some of the older threads in this forum with "CAI" in the subject-- there are many-- and all the relevant info is there.