First time renting a car and driving from Vancouver down to Seattle.

I tried reserving from dollar rent a car and noticed the car rental was $82, but then was shock to find the one-way fee was $500.

I have no experience with renting cars and going cross boarder, any better ideas on how to rent a car to drive from Vancouver to Seattle one way?

We want to stop off mid way through our drive and don't want to be stuck on a train or bus.

Thanks!