In short, if the holster isn't made specifically for the SR9C, you don't want it. You want a holster that is made for "A" not "Fits A, C, K and W"
Expect to spend $50-$95+ for a good holster
These are my "go to" holster makers:
Comp-Tac : Top-Quality Firearm Accessories
Desbiens Gun Leather
Galco holsters; Holsters; Gun holster, pistol holsters, western holsters, shoulder holsters, leather holster and Glock holsters
Garrett Industries, LLC Designers/Manufacturers of Custom Kydex and Leather Holsters and Tactical Gear
H.B.E. Specialty LeatherWorks
Haugen Handgun Leather ::: Quality Handcrafted Leather Goods For The Discriminating Shooter - concealment holsters, hunting holsters, cowboy holsters all hand made - Haugen Handgun Leather
Milt Sparks Holsters
TT GunLeather High Quality Leather Gun Holsters
Tucker Gun Leather | Premium Leather Gun Holsters
High Noon Holsters
Of those I would strongly recommend UBG and High Noon.