DePere, WI? You're the closest member to me so far!
I manage a dealership in Omro (west of Oshkosh), and we do lots of builders. One great resource is CertiFit
www.certifit.com
They have new aftermarket bumper covers at ridiculously cheap prices.
Another source is Keystone...They have a store in Appleton. Not sure if they have a website, but their number is 1-800-422-1995. (Edit: They do have a website...
www.keystone-auto.com ) They also have good prices on new aftermarket body parts, and since you're close, it might be worth it to just drive there and buy one versus getting it shipped. The CertiFit store we deal with is in the Twin Cities, but they ship SpeeDee anywhere. (1-800-628-4098)
For a used one, check
www.car-part.com if you haven't already.
If you need more help or want me to check with a few of my connections, PM me and let me know what I can do to help. I have a good hookup with a few excellent independent bodymen too, so if you need help doing the install, I can possibly save you a few bucks there too.
Oh yeah...I feel your pain as far as front bumper covers go. Mine has been repaired twice already, and needs to be done a third time! First time I got hit by one of our mechanics, second was my own stupidity when I rear-ended a Caravan, and the third time I guess was also my own fault...I drove too close up to a frozen snowbank, and cracked the previous repair.
Just tonight my boss almost clipped the side of my Explorer with his wrecker...He was talking to me while backing up, and not looking in his right hand mirror. I swear this Explorer has a target on it!