It depends on many factors, and what you would use it for.
The price of a GPS depends on how many features you'd like. You can go to gpsreview.net to see what a basic model would cost, and compare it to a model that has a lot more bells and whistles.
One of the best GPS apps for the iPhone 5 is the TomTom GPS app.
MOTOsafety GPS Tracker
garmin gps is the best by far! you can find all sorts of accesories and software for them anywhere that gps are sold. also they are the easiest gps unit to use!
Finding the best GPS can be a daunting task. After much research, I have found to be that the Tom Tom is the top rated GPS.
The Garmin GPS 12 Handheld GPS Receiver is one of the best for wet outdoor conditions.
MOTOsafety GPS Tracker
Gps provides best path compare to Agps.
One of the best GPS is Gamin. One of the worst is Tomtom.
The Garmin n_vi 250 3.5-Inch Portable GPS Navigator appears to be the best and cheapest GPS for your car. It is available at Amazon.com for $188.00. This GPS has great reviews.
The Acura in-car GPS units were the first to get traffic information overlaid on their GPS displays, and still are the best.
You can learn about the best GPS handlebar mount on the following site: http://www.webbikeworld.com/garmin-gps/garmin-gps-handlebar-mount/. They are definitley useful.
Accordimg to PC Mag, Garmin nüvi 3590LMT is the best golf GPS.