I've got a 21" DID rim I'm going to posting in the classifieds later today when I get pictures of everything. It's laced to a drum that I modded to take a 17" axle for mockup purposes, I wouldn't actually want to run it that way. I'd sell the rim for $50 plus shipping, if you wanted whole wheel you could have it for whatever the difference it cost to ship.
If you check out my build thread you can see the wheel mounted on the bike and what the same rim looks like when mounted to an xs hub after some cleanup.