Concerning ECN-2 films, (there was a url link here which no longer exists) (HOWTO article, really) has formulas and procedures for processing it yourself, if you're comfortable with mixing your own developer. The big caveat is that the rem-jet backing has to be removed. I've never done this myself, for various reasons, so I can't say from experience how difficult it is. The last I heard,
Dale Labs processed the stuff, but I haven't verified this lately.
For those not "in the know," ECN-2 films are color negative films used primarily to shoot movies. These films weren't designed for use in still cameras, but since 35mm movie film is identical to 35mm still film in width, sprocket placement, etc., it can be done. As discussed in the thread to which I linked, though, the ECN-2 films have different characteristics in terms of contrast, so you might not like prints from these films made on conventional RA-4 paper. The point of relevance to one of the directions this thread has taken is that some (all?) of these films are tungsten balanced.
If you really want to try shooting some, search for "(vision2,vision3)" in the cameras and photo section on eBay; there's somebody there selling 200-foot spools -- mostly unsuccessfully, judging by the auction histories. I believe there's at least one non-eBay source for movie "short ends," too, which would be similar amounts, but I don't recall the URL offhand. There used to be outfits that sold single rolls for use in still cameras, and processed it for still photos, but AFAIK they all switched to conventional C-41 films in the 1990s.