Magellan Roadmate 700 GPS What Websites Can I Downloads Free US Maps From For My Magellan Roadmate 700?

What websites can I downloads free US maps from for my Magellan Roadmate 700? - Magellan Roadmate 700 GPS

My brother borrowed my Magellan RoadMate 700 GPS and I do not know what he's doing, but all tickets are gone. I do not want to pay $ 70-100 + maps. Does anyone know of sites that I can download maps for free. I looked at many sites and can not find anything. Please help. Thank you: D