Yeah, I've been looking online. I'm not seeing tons of options for a 3" 101.
Crossbreed, Kolster make an excellent Iwb holster for the SP-101, get the horse hide for moisture protection. The only time my SP-101 comes out of this holster is to get cleaned or to practice drawing from the holster, I even leave it in the holster while in the safe.
The factory grips were whacking my knuckle so I swapped them out for these...much better. If you ever get scratches on it you can get them out easily with Scotch Brite(the green kind) and then some Mother's Mag Polish.