It's $7.
Psssst. Park at the Renaissance Resort and then walk across the street. There is a parking lot to the side of the building with many spaces, noone will mess with your car and there is no guard. As you get off I-4 and head towards SWF, get in the left hand lane and turn left at Sea Harbour drive. The resort is on the left, huge 10 story building. Go inside and check it out, you'll end up staying there in the future like I did.