The folks at Pre-Flight Parking near RDU informed me last night that the site is no longer taking new parkers, and will be closing as soon as the last car is claimed. Apparently within the last week the company that owns Fast Park bought out the Pre-Flight location last week. (A couple of employees said that they offered Pre-Flight employees $2 less per hour, too).
So, it appear that there are now only three alternatives for parking at RDU:
RDU: $12/day – Park across the street from either terminal
FastPark Parking: $5.45/day – No walking, covered parking, complimentary car wash, bus delivery from your parking spot to terminal front door.
District Drive Park & Ride: Free – Ride TTA’s bus ($2 each way, exact change) Route 100 (.pdf). Note that this option is only convenient for late morning/early afternoon arrivals and departures. Lot is not under surveillance, but there is security-by-obscurity in a safe area.