Lead on a good HUD

I just went from a Grand Prix GTP to a 2010 Camaro and while I love the Camaro I had no idea how much I would miss my Heads Up Display that was in the Grand Prix.

I don't even want a fancy one, speed is all I need, not shift points, or GPS maps, or any other information, just speed would be fine.

Ideally the unit likely be GPS based so it could get the speed without having to wire in to something in the car or if it does have a "control" unit that wires in to the car it uses bluetooth or something to get the data to the display.

I have hunted pretty well but only seem to find a couple of units, one that is way overkill and the other, just looks like junk. The best one I have seen is only in reviews but I can't find any place that actually has one for sale.

Links to places that sell them or companies that make them would be great.

Thanks