Work it into your financial aid package. If you are a student on financial aid your housing costs will become part of your overall education costs and help you get a higher award.
Get a scholarship. Scholarships can be using for any expense that is acquired through the university, which includes on campus housing. The extra work will be well worth it when it comes time to move in.
Land a job. You can get a part-time job while in school or save the money you earn from a job during the summer's between academic years to raise the money to pay for your on campus housing.
Apply for a loan. Many loans that are available through the Department of Education are deferred until after you graduation from college and can be used for anything, as the money is paid to you through the financial aid office.