You could find the TomTom XL 340S GPS Navigation System for around 140.. with shipping, their may be cheaper but not as functional as the tom-tom.
It is becoming more common for vehicles to offer built in automotive gps. Some of the models they are available in are vehocles made by General Motors which feature the onstar program.
Garmin Geko 201 Handheld GPS Receiver is one of the cheapest GPS devices out there for under $90.00.
NZ Maps can be purchased online for most GPS devices.
The Garming Forerunner 205 is a great GPS running watch that is very inexpensive and available through amazon.com. This information is from runnersworld.com
There are good and inexpensive GPS systems for trucks. These GPS systems for trucks include Garmin Nuvi 465t 4.3" GPS Truck Navigator and IntelliRoute TND Truck GPS.
There are many different types of automotive GPS systems. But, one that has the best reviews is the tom tom. Here is a link to some of the others. http://reviews.cnet.com/best-gps/
Depending on the brand, the price of an automotive GPS unit will vary. The prices of a Garmin have been listed for as little as 120, or as much as 290.
Garmin and TomTom navigation systems are the two most reputable brands and are the two most purchased gps systems. I prefer garmin over tomtom; depends on each consumer.
The best automotive GPS system available would be one that would update automatically on a weekly basis. Roads are constantly changing therefore maps are constantly outdated.
GPS systems sales have actually gone down because most of the smart phones that are available now have an app that is included with the phone. The GPS apps do just as good as the main GPS system Tom Tom.
Tom Tom GPS recievers are available at most retailers and electronic stores. It is even available on QVC.com and HSN.com which ables to compare and contrast the TOM TOM for your lifestyle.
You can compare automotive GPS devices on the internet. Whether it is for quality, price, etc. You can also ask in forums made especially for these kinds of talks over GPS devices or find reviews on the products you are looking for on websites such as amazon.com.