Greg- to my understanding no one is manufacturing NMC. We had a presenter at an IAEI program a few years ago and he said that there isn't any demand for it. If someone know differently I would appreciate an update.
I have never seen NM-c either. The wire manufacturers link you to UF when you look for it. I just thought NM-c would be NM without the paper. I think I heard about it from one of our northern neighbors. Do they have NM-C in Canada?