Free: Contests & Raffles.
I’ve camped at the kettle falls campground a number of times, it is nice campground. I think it is 9 dollars a day for non peak camping. There is also a campground up by the refuge by starvation flats that is a state camp ground that is nice has a small lake to fish. You can also camp on the refuge which I’ve done and is a nice area to camp as well.