Hibben, himself has made a little less than #500 total stainless custom Rambo III knives. There was also a handmade version using damascus from DamascusUSA. He also made some minis.
United had 3 almost full sized (about 1 1/2" shorter) versions. One was regular, one was a signature model with an almost black colored handle, and there was a 10th anniversary model with a special shield. I'm not sure if all were, but some were made in Taiwan.
United also made a plain mini.
DamascusUSA also made a mini, and might of made a large version(I've never seen one, but have seen early talk of them).