I use a Desantis mini belt slide leather holster for my CW9. The holster fits the gun great and its very comfortable to wear. It is kind of pricey, but it is well worth the extra cost. I think Desantis, Galco and Bianchi make paddle holsters for the CW9.
I actually screwed up and ordered a right handed one. Luckily I caught it and called! The sales people there seemed really easy to deal with. I'll be glad to get it cause I've recently decided I hate IWB holsters!