It's really simple. If you buy from CDNN, the local dealer only gets the FFL transfer fee. He doesn't make much money on the deal.
However, I see NOTHING wrong with dealing with them direct. My dealer is also my friend and he has NO problem with handling my FFL transfer for a modest fee.
The 50th Anniversary .357's are flattops and among the most attractive and useful revolvers that Ruger has ever made. I have a .44 Lipsey Special Flattop as well as the 50th Anniversary Flattop .44 Magnum. I really ought to get one of the .357's while they are still available. They are sweet revolvers.
Dale53