We just flew to Orlando and back this past week from Flint Bishop. It's a great airport to fly out of. We parked in the economy lot (DH dropped us off at front door, drove to economy lot across the street and came back by the free airport shuttle and it only took 5 minutes (if that)).
We were there Friday morning and left Monday night around midnight and our bill for parking was $20. They have a website that lists all the parking fees per parking lot and it also has a lot of useful information. You'll never want to fly out of Metro again after this experience!