You should take a look at Fist Holsters
FIST Holsters
They make several styles of OWB holsters and they can accommodate any size S&W. I've got a couple for my 3.5" and 4" N-frames and they build them generically with a full lug barrel channel, which my guns don't even have, so you just tell them the length you need. Keep in mind that the cylinder space is also generic for a model 29 style cylinder, but that hasn't bothered me with my guns. The quality is very nice and the fit and draw was perfect right from the beginning. They're very comfortable even with my heavy guns, and I can wear it all day with no problem.
The best part is that most of their models are way under $100 and they have fairly quick delivery times. Here's one of mine, a #12 Basic:
