Visit your college financial aid and scholarship office, and develop a relationship with your financial aid counselor. One of the main functions of any financial aid and scholarship office is to aggregate scholarship and grant opportunities for students. Even if you do not have a strong academic record, you will find many non-academic scholarships that reward students for unique talents and extracurricular activities.
Advertise your tutoring services to other university students for difficult classes and subjects that you have previously studied. You will find that many students are willing to pay to have you explain and provide insights on exams from previous classes. Try to tutor students in small groups so as to maximize the use of your time. Note that some professors will provide old exams as a study guide, whereas others will disapprove using such material; you should contact the professor during office hours if you are unsure of her standards.
Sign up with the note-taking service, if available, at your university student center for classes that you are attending this quarter/semester. The note-taking service pays students to take notes in class and then sells these notes to other students. Note taking is a particularly easy task if you are comfortable with the course material and already take notes in class. Please note that you should only work for the university-sanctioned service so as to avoid any possible ethical conflicts; you will also need to attain written consent from the professor of a class before the note-taking service will employ you.
Participate in social science research experiments and surveys as they are offered by the various academic departments at your school. You can usually earn the equivalent of lunch and dinner for a short participation session. Develop contacts within these departments so that you can quickly reserve a space when opportunities are available.
Offer services to other students based on your own set of personal skills and belongings. If you have experience with computers, offer to troubleshoot other people's computers for a small fee. If you have a car, offer to drive people around for the price of gas and a small tip. If you have textbooks from previous classes, lend them to other students for a set price each quarter/semester, or sell them outright if you no longer have need of them. You can usually advertise your services through word of mouth or the campus bulletin. You can also find people requesting specific services through your school and local newspapers and your social networks.
Write for the school or local newspapers on topics of personal interest. Newspaper editors will often hire freelance writers to cover local social events and gatherings. One well-written piece can bring you future work and future professional contacts.
Apply for a part-time job on campus, at a restaurant or at a local retailer. While these jobs may seem less than glamorous, employers will pay steady and will usually will work around your schedule. A part-time job at a restaurant can be particularly rewarding (compared with other options available) when you factor in potential tips on top of your base wage.