Is this in an urban area with a lot of public transit (like nyc, SF, Chicago)? If so, they should use transit, car sharing, bike, taxis, and rent as needed.
The Carmax idea is not a good one, because you're buying "high" and selling "low". An older car purchased and sold privately is your best bet. You can also research used cars that hold their value well. An extreme example is Jeep Wrangler, if you don't mind crappy gas mileage.