ISU Financial Aid: http://www.financialaid.iastate.edu/students/studyabroad.php

Full List of Scholarship: http://www.studyabroad.iastate.edu/Financing/Scholarship.html

Fundraising Ideas:
http://www.studyabroad.iastate.edu/Financing/Fund_ideas.html

Student Discounts:
http://www.studyabroad.iastate.edu/Students/travel-resources.html

People who have planned it have saved up throughout their high school years. So in addition to maybe donations from parents and relatives, they have savings for regular living expenses and tution fees.