What would be the cheapest way to travel from the Sea-Tac airport in George, WA?

I have planned to go to the Sasquatch Music Festival George, WA, on Sunday and Monday and I live in Southern California. I was checking the prices of taxis, and do not want to spend $ 250 for George in Seattle / Tacoma airport. There would a better solution, in addition to rent a car (I have 18 years, and no one will rent to me)?

A rental car is the best option, but I am account that will not give one to 25. Perhaps a Rent-A-Wreck, could to see if the self. A taxi is a bad choice because it will leave and no taxis to take you back to George. Check the bus lane is not – not that I think there is any, but could have. Maybe you can find someone on Craigslist who will share their journey you if you pay a portion of the cost.

Boeing 767-400ER Taxi & Takeoff from Seattle-Tacoma [FS2004- HD]