Yeah.. This is the problem.. Finding any parts really! I am going to assume you are in the Cheyenne area? If so, another local hit would be Buds. They wont hve the color you want, but they will have the door!
Long shot, but with better chances, would be LoveLand Auto Salvage. They specialize in 4x4s too!
Uhg... Very frustrating! LOL! Well.. check out the Loveland one.. it is in Loveland, so you may want to call them before making the drive. If all else fails, I guess get a door, take it to Franks Autobody (best rates) and let him paint it for you!