Well, depending on size, I have some recommendations. Two in particular.
One is the 686 or 686+ (6 or 7 shots, your choice) in 3", perfect for belt or IWB carry.
The other is the Model 60. A 3" 5 shot J-frame, easier to conceal. There is also a "Pro Series" that is a little cooler looking with adj. night sights.
Both of those are single/double, but you could get a good gunsmith if you know one, or you could get Smith's gunsmiths in the Performance Center, to stone and disable the single action components to make it fire double only, or even just file off the hammer spur and semi-disable it that way. I doubt either would cost much considering what is involved, and they may even just replace it with their DAO stuff the police use --call 'em. I wouldn't do this myself, but that is one way, and if you had them replace the parts you could keep the DA/SA in case you wanted to go back.
I once owned an old police trade in a long time ago that was a 4" stainless .38spcl. DAO with the spur removed. Just wasn't for me. Now I didn't see any DAO revolvers in my Smith catalog today except for the '40 series, the ones with concealed hammers, but I do know Smith makes or used to make these for police departments that had to have DAO.
Another Performance Center option, this may cost more, I don't know, would be to have them fit a Model 60 barrel to a 640. The 640 is the 5 shot concealed hammer J-frame and is DAO. There are also a few of the Night Guards that could be modified.
My advice is, if money is an issue, to look for a good deal on a 640 (or 340PD if you want super light and can take the punishment, I love mine) or a 649. This revolver has the shrouded hammer, so it can be used SA, but it is obviously a mostly DA tool. It has a 2" barrel, so you'll take a hit on that one inch. I just got my wife's 649 at a gunshow for $450 cash, barely used, shoots GREAT.
If you are stuck on the 3" and DAO, then at least for Smith, a call or trip to the Performance Center is in order. But they may be able to recommend a S&W licensed smith that is local, who knows? If it is a parts swap, that won't be hard at all with the MIM parts.
There are other manufacturers, but for me, Smith and Wesson is it. Best bang for the buck!