Either you go see @Labowski or @Northgagunman and take your pick from their ample selection ( they have a Windstar newer than mine for way cheap and a Hyundai Accent even cheaper) or you find an auction where the city/county/state vehicles go through. If you're willing to ride to middle GA then T Lynn Davis is your best bet. Plenty of late model Crown Vic cop cars going through there every week. Not to mention every other public service type vehicle.
I'm in your neck of the woods way way down SE GA