I meant to reply on this thread but when the thread was created I was on the run and then I lost track.
This is something that has interested me for the last few years, but never did anything about it. Would really like to have a privacy hedge as we're on a corner lot and one of the streets is at times quite busy. Actually I did try to get some cuttings to root, and was not successful at all. They all died and no roots. But then I just put the cuts in water, and it was middle of summer. That same thing worked well for the elder cuttings, which developed lots of roots; perhaps I'll open a thread about the elder bush we got going.
Some fellow here in the village provides small 2-4 ft baby cedar for a price. It looks like he digs them out of the wooded areas nearby.

Not sure how good a hedge you end up with though.
Since then I got these rooting boxes but never found time to try them. The plan was to try them this Spring but as usual, other things became priorities.