13.  Brown University

Located in Providence, R.I., this Ivy League school budgeted $135 million for need-based financial aid last year. The annual price of attendance is $69,010, but only 42 percent of undergraduates pay the full amount. Families earning $30,000 or less pay an average of $5,335, and those earning $30,001 to $48,000 pay $5,459.