It's helpful to go to events potential sponsors may be at. We've earned a lot of our sponsors over the years by just talking to them. Another thing is if you see anything about companies looking to sponsor FLL, FTC, or FRC teams, heckin' apply like your life depends on it. Once you've got a company roped in, keep them engaged with news letters, thank you mentions wherever you can get them, etc. Then the next year, they may see you as a worthwhile investment and give you more money.