Park on the road for free; just be wary of the trench on the Castle side, when sundown occurs, and the parking signs and you will avoid a ticket.
It's free to visit, but parking in the lot has a fee that's self service. Envelopes for payment can be found at the front ranger station. I believe it's $8. Remember to bring cash.
Parking lot is 8$. Look at my pictures, I got all fare tables
$15 to both park inthe lot and camp at the hike in campsite.
Ryan is right
There is free parking on the side of the road along Skyline Blvd. I've never parked at the actual lot so I'm not sure what the cost for that is.
Parking is $5, but you can always park along the road.
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