Seems like the 02's are a dying breed. Well I was echo the same question after I did a lot of research. All the cool custom bumper sites that have been talked about in the past (MonsterBumpers, Stealth Bumpers, Iron Bull...) are either out of business, no longer offer bumpers for 2002 models, or are crazy priced ($2500+). I was about to give up when I was reading about a guy who had a custom bumper fabricated for him by a buddy.
I started searching and eventually found Billy of Brute Force Fabrication (http://bruteforcefab.com/). This is a one guy shop, but he's a hell of a fabricator. Although his site showcases Toyotas, he's done Jeeps, Nissan Pathfinders. and now he's eager to do his first Avalanche.
I had a disagreement with a camouflaged fire hydrant in a parking lot and it ripped the front cladding off and bent the metal bumper itself. My insurance company paid me well and I decided to see if I could get a custom bumper for the money I got.
By the indicator of the work he has already done (look at his web site) I'm sure I will be quite satisfied. His price point is about $1000 less than the discontinued bumpers I saw advertised on other websites.
Work starts October 2012...
If interested, I will try to post pics as I get them.