Where can I find an aerial map with cities and zip codes for free?

I need an aerial map of North Carolina with the zip codes showing on it as well as the cities. This is for my job to help my employees to get to their jobs better. There has to be somewhere on the internet where I can find one for free. Or at least one that I can print out.|||www.maps.google.com|||http://maps.yahoo.com|||Either Google Earth or Google Maps..