It's actually free, but there's a suggested donation of $5. Climb >4,000' of narrow curvy road out of Bishop to get to the Bristlecone Pine Forest, and your bonus is this sweet little campground.

There are no numbered sites, it's all kind of freeform in a nice way. Short walks get you spectacular views west to the Sierras across the Owens valley, and east into the interior of Nevada.

Some ATT cellphone reception but not great.