So I've had a Natural Elite keyboard forever. Picked up a 100si mouse pad and was fighting for space on my standard Sauder garbage keyboard tray with sliders, but no height/angle adjustment.
I just happened to run across some desks in my local "recycled building supplies" store that had some killer adjustable supports on them. Even better, I found one of the desks that had been dropped and the tray was broken off. I picked up this nice mounting bracket for $10.
The tray itself is a part of the desk that I was going to throw away. Cheezy particle board which is now covered in roll-on truck bed liner. Great for keeping things where I put them. My only current gripe is that I didn't leave myself enough margin for rounding the edges over and sanding. I do have enough room that my mousepad isn't hanging over the edge of the desk now, just not enough for a any re-adjustment.
edit: added images since I don't see the pic I tried to attach. Aplogies if it shows up twice.