The sale of new duty size 38 spl/357 revolvers with 4 inch barrels is practically nonexistent. I haven't seen a new one in a gun store in years. The overwhelming majority of revolvers being sold today are snubbies and cowboy single action models.
That's part of why the 10 is on life support. The 686 and GP100 are part of what killed it.I see 4 inch 686's and GP100's all the time at the gun stores.