Where would you suggest finding homes for foreign exchange students on short notice?

My wife works for a non-profit group that places high-school age foreign exchange students here in Austin. They have an urgent situation in which they have 5 students from Japan and S. Korea that they need to find homes for, like, within the next 24 hours (long story, not important as to why). She and I have been brainstorming, but I thought I'd turn to the wisdom of the crowd here and ask -- if you had to find homes in Austin for these kids within 24 hours, how would you go about doing it?