If you're looking for an ultralight, I can build you one. Not cloth covered though, which would make it super-ultralight, because I just don't have the time or a sewing maching. I handstiched mine. I'm not so sure a center grip would work that well on an ultra light though. I can pretty much make any shape though. I've made mine with a spear notch, and Renner's ribcage shield, and my old jack-o-lantern sheild, and they all work well. I usually do the straps out of leather now, but I'd have to size it to your arm and stitch it up on site. It'd only take me like 10 mins, tops, to do that though. Without a design on the front, it'd be about $15-20, depending on if material costs have gone up. (And since I think I'm out of leather long enough to go around your forearm.) With insignia, you've gotta tell me pretty soon, and it'd be a little more, depending on complexity.
~Matt, OR variety