We are flying into Sanford in November - never tried it before. We decided to rent a minivan from National (there are seven of us going this time!). Got a great rate using the old DC code and a DC coupon, total of $250 for 8 days, including taxes and fees.
One little hitch - we are getting in at 10:30 am, so that's no problem, but we don't fly out till 7:30 pm, and the rental agencies close at 5 pm! Our agreement says just see the agent when we pick up the van for drop off instructions, but if your flight were arriving late - that might be a problem!