I am looking for a GPS that can follow a route turn by turn, (able to load gpx, kml etc onto it) I currently have an android phone, and its a problem because I can't have my screen on the whole time, (battery drain) and I am looking for a gps to follow routes I can't remember. I am looking for a very cheap one, and the garmin edge 305 seems alright, but is there any cheaper?

Thanks.