You can buy all the individual parts from ARB, no idea what the price range would be though. It wouldn't take much to build your own or have a shop build some new mounts for you, it's a pretty straight forward piece. The one thing you probably wouldn't get by doing custom mounts, are the crumple zones that allow ARB bumpers to be "air bag compliment". (Pretty sure that's what allows ARB to make that claim)
If you can get the bumper cheap enough, it would be worth doing.