Based on that picture, I don't see what's so unusual about it. Change out the buttons on a surplus coat, and you've almost got the same garment.
It's cut short, has some weird shoulder roping going on, and probably has super high armholes. You won't find those in a mil surplus coat. If you want to find the coat you should start asking around at the retail stores that would have carried it. One of them might still have them on the rack and would probably be on sale.
I dont know of anyone else that carries anything even similar at a cheaper price but i will say i tried on this exact coat when it first came out at barneys. The salesman insisted it'd look good on me and seriously it was one of the nicests coats. I love how its cropped and i especially loved the buttons. I think it also came in a red tartan type fabric (something similar to what a hunter or something would wear)