carpooling/sharing a cab UNICON

I’m too young to rent a car, so I’m looking into transportation from SEATAC to snoqualmie. I don’t know if there is an easy way to do this, but I’m wondering if anybody else will be arriving mid-day friday who might want to share a shuttle or taxi or rent me a seat in their rental car. I would also be looking for a return ride to SEATAC on tuesday afternoon.

I know this is pretty unlikely, but if I can’t work out a rideshare thing, its probably going to cost in excess of $50 each way for the taxi.

Did anybody take a taxi when they arrived for NAUCC? What did it cost you?