Big cities in developing countries are expensive too. A better idea would be to find some beach property in South America; the continent is developing and getting older as well, so lots of people are retiring to the sea-side (as I said, big cities are expensive).

In the south of Brazil you won't find many bargains left, but I've read that lots os europeans are buying houses in the northeast (the infrastructure is a lot worse there, but it's 3.000km closer to Europe).