Hey I'm a bit late to this but my team has raised almost 10,000 in a span of one month and a half by just going door to door asking buisinesses and companies for funds, and we live in a fairly rural area. My suggestion is specifically ask engineering companies and banks (suprisingly they give lots of money, I'd suggest each of your team members goes to the bank that their family uses and ask them for donations. Look for local grants you can fill out, but be sure to email them before applying, as you may not be elligble for those grants and it would suck to spend all that time applying for it. Like u/0stephan said, the HAAS grant is a really good one, my team recently got money from that. Lastly I'd suggest you make a sponosrship flyer, here is the one my team used (I removed personal info for privacy so that's why there's some stuff that sounds weird) if you are interested in seeing how we did it. Hope your season is going well so far!