My Duty Pistol is an H&K USP .40...my off duty/back up is my P99 or a .38 Ultra Lite (Depends on the weather) at my department when we qualify (quarterly 80% min.) we must qualify with any thing we carry (dept. approved)
Earl's Repair has Level II and Level III leather duty holsters for the P99. http://www.carlwalther.com/holsters.htm
You could probably find them cheaper, if you can find out who mfgs. them.