How hard are you willing to work for it? If you are looking for a one shot big bucks deal, its all about targeting and finding someone within the company to be your spokesperson.
If you are willing to work for every dollar, but want a better profit margin than the 20% you get off of candy bars, or even the 50% you get off of hexbugs... try the 100% we get from our Patron Drive. Students go out and ask local businesses and family businesses for donations. We get anywhere from $25 to $1,000 per sponsor, and bring in over $9,000 per year (outside of Harris's sponsorship). You can find our
documentation on it here.
I'm a firm believer in "where there is a will there is a way" so if you are willing to work for it, go the patron drive route!
There are also tons of grants out there that you can write in for... everything from $500 to $5,000. Harder to rely on, but I know the Naples(1551) took 3 years to raise the funds to start up as a rookie... perseverance can be key!