Whereas we get plenty of mainly tertiary level international (mainly asian) students, looks as if the "international schools" are not too many at all.

Google "i....s..." http://www.google.com.au/search?hl=e...cr%3DcountryAU and on first two pages you get Glenunga in SA on page one professing to be one and then the American International school looking to be in Sydney sneaks in at end of page two.

I'm not sure if they would be in great abundance in other countries as the demand would be in accordance with expats seeking something different than what was available through normal curriculum.