I was wrong - it was $15k, but still a pre-sample (buyer needs to be an FFL/SOT). There are a couple transferables in private hands, but I would estimate a transfereble to run somewhere in the $25k+ range (IF you can find one - I doubt there's more than a dozen transferables in existance)
I have a Glock 18 and it is properly the most fun machine gun.
I enjoy shooting it and since parts are cheap I don't worry using it.
If I would get a 93R it would be only handled but not shoot, because of the fear of breaking it!!