This is a challenge for every team. Don't get discouraged. Start by familiarizing yourself with the overall programs of US FIRST and its benefits. I suggest you read the the most recent annual report available from the US FIRST website and other materials in the communications center.
Then create some documents similar to these:
Next, make a list of every company you've done business with, every service you use regularly (dry cleaners, dentists, doctors, auto repair, etc). Anyone with whom you have a personal relationship. Ask all the parents to do the same. Ask them for small donations.
Now, the hard part: Going for the bigger donations. Make a list of the local companies and organizations that may be interested. Call them and ask them if you can bring your team in to make a presentation.
See these links for examples:
Note that local public colleges rarely have funds, but corporations do.
Also, check out the cool Interstate Batteries fundraiser.
Remember, you have to ask.
// Miss Minifig