Well, I have a few holsters - generally, I carry OUTSIDE the waist in a leather belt holster.
But, I have a cheap Uncle Mike's Inside the Waistband holster - made out of a felt type material. I bought it probably 10 years ago for my Glock 26. I no longer have the Glock, but it fits the P99c perfectly. U can get one for about $10.
The holsters are numbered, and I'd give U the number of mine, but from I can tell, they have been re-model numbered since I bought mine. So, if U find these at a guns tore, U may wanna ask permission to bring your unladed gun into the store to try it out for size (I've done this before a few times over the years - go in w/o the gun first and ask, however).
I still use this holster several times a week, and if ya wear cargo pants, U can put it into your front pocket as well. The belt clip helps break up the shape of the gun.