I have a DeSantis IWB for my R9S, the kind with the pouch for the spare magazine stitched into it.
It works well, it was inexpensive, and I use it sometimes.
Though lately, IWB, I have been going G26 and Sidearmor.
I use the DeSantis Nemesis pocket holster more with the pup, and I have a Hedley pocket holster on order.