Paper maps are cheap and obviously prices for in-car GPS will never match their low cost. However, the cost for portable navigation systems is dropping considerably and nowadays, you can get your hands on one for $250 or less. Granted, you're only getting the most basic systems at this price but consider that for the money, you're also getting the convenience of having all your maps in one place, visual and voice-guided directions so you're not fiddling with paper while driving; and access to a large database of points of interest. It's a worthy investment if you're on the road a lot, whether you're shuttling kids from school to soccer practice or crisscrossing town for business meetings. Here are six affordable systems that you can get for cheap.