There are many affordable gps units in the market today, learn about the best gps systems for under $200 or if you have a little more $ you can look at this list for the best systems under $300
Garmin make the best gps systems IMHO, but for under $200 you can get the Mio C220 which is a great system with tons of POI's, if you really want a great deal you might win a Mio C220 for free by entering this contest.