$$$$$ is about $170, install is simple. It sticks to dash with double sided mounting tape and you can either install a little plastic sheet on the windscreen that shows the display, or use the plastic screen that clips to the device. Personally I would use the clip on screen, but it won't be as high up when displayed, but when you are not using it, at least you don't have a small plastic screen in your sight.
http://www.cnet.com.au/garmin-hud-339346150.htm