Hi jftrujillo,
Welcome to Laptop GPS World.
If you are asking how much it costs to set up a laptop for GPS navigation, then I'd say it can be as little as around $50, if you buy for example Microsoft Streets & Trips 2009 with GPS Locator. It contains the software program, and also a USB GPS receiver. That's all you need. Some other packages may cost you $60, $80, $110, and perhaps even a little bit more.