Elaborating on what Siri said, food fundraisers can really help. Our team went to several restaurants and asked if we could hand out fliers to people. When they showed the flier at the restaurant and made a purchase, part of the profits came to us. We received about $100 per restaurant. If you do multiple restaurants, you can make some big cash.
You can also ask a restaurant to sponsor you by giving free food for your team meetings.