Best I've heard on the 9mm barrels is to keep checking ebay, gunbroker, and auction arms. They show up there occasionally. I don't think anyone makes them anymore (surprising, since they seem to sell like mad), so they typically fetch a good price. Doesn't seem like anybody has any stock left to sell en masse anymore.
Good luck on it though - I'm looking for one myself. I like my CZ-52 but these days it's just become more economical and simple to take 1 type of ammo to the range to shoot all my guns, so I'm trying to settle on 9mm for everything
.