INTERNATIONAL SCHOOL SO EXPENSIVE (Bangkok)

Hi, just relocated to Bangkok last week and finding that all international schools are so expensive compared to Australia. Does anyone know of any bi lingual school or christian schools that are not so expensive. I feel that the international school is only catered to either the rich or to the corporate world, that can afford to pay their employees kids school fees. Unfortunately were not one of them lol!!!! Are there any normal international school that dosnt cost the earth??? Any recommendation would be greatful.