This guy on Auction Arms has a few: http://www.auctionarms.com/search/di...temnum=8241610. Not sure if the have a spent case with 'em, though. I think he's in SC, but says he'll ship out of state.
There are also a few on www.gunsamerica.com, but I do not know if any come with the requisite fired case. In fact, I don't know that Colt provides a fired case with their pistols.