My answer to not finding a 3" N frame holster is simple:
Put your N frame in a 4" holster and note where the barrel ends.
Allow 1/2 inch more and cut the holster off.
You now have a 3 inch holster...
I carry my 5" 629 in a FIST kydex/leather hybrid canted IWB holster. I like it more than my Sparks VM-II. FIST makes a great product at a great price. I intend to do business with them in the future if they have a product that fits my needs. Their turn around time was reasonable too. Not sure what it is now.
Thanks Ray, I really liked what I saw. I see us doing business in the near future. I have to decide which one. Kinda leaning toward that Tom Threepersons, even though the Model 1 might be more practical.