I use the same holsters that I use for my M&P40. I have a Fobus, a Bianchi and a Blackhawk Cover Six. They are all about an extra 3/8" long, so a holster for an M&P40c should probablywork out just about perfect. I tolerate the extra 3/8" of length, because the holsters will do double duty and they are familiar.
Works for me!! :D