well, i've now purchased 3 jdm front bumpers and 2 jdm rear bumpers. i've probably purchased more jdm bumpers than anyone in the U.S. <-- that's a painful laugh.
i say first go to Jimmy at HKC-speed. i don't think he carries any in inventory, but will source one for you.
japanparts.com is another good site.
also, check out www.nengun.com these guys are very responsive...gotta give SnoDork credit for introducing me to nengun.