Have you at least tried the classifieds here?
Check you local Junk yards, ebay, and Craigslist.
This part of the sub is for help, maintenance and general discussion.
Consider posting up a Want to buy thread in the classifieds and on Craigslist.
Beyond that. You can use any year bumper for your 4runner 96-02 with slight modification for the slim lip, or any 99-02 fat lip.
If your bumper is painted to match the rest of the vehicle you will be hard pressed to find one in your colour. I wouldn't hold out for one. Chrome is hard to paint and have it hold.
Beyond that, most people here either still are useing their bumpers and will be for a long time, or have long since gotten rid of them, the exceptions being ones posted in classifieds or rig part outs.