How can I raise 4000-4500 dollars in 4.5 months?

I'm on Alaska's high school rodeo team, I need to raise about 4500 dollars in order to go to national finals in Wyoming. Rodeo means a lot to me and my family just can't afford it. Our team is small but we work together to do all different kinds of things to help us earn the money last year we just barely made it. We worked at community dinners, had car wash's, sold coupon books, and got sponsors. Its hard for the 10-14 of us to all get sponsers from such a small town. Any ideas on fundraising that will raise us alot of money? We are doing a cash raffle right now. That is for general funds though I.E. team pictures, awards, and money for when our directors have to go down to meetings and such. Anything you guys have done that works or any ideas would be great!! Thank you so much(: Ps Remember we live in Alaska.