Holster options for the HK P30 lineup aren't plentiful to say the least. Out of the few I've tried, this JM custom kydex aiwb holster has hands down been the best :
Holster Classique OWB
HK P30sk rt/brn/IWB/P30sk custom leather holster - Jackson LeatherWork, LLC
P30sk - Jackson LeatherWork, LLC
H&K P30SK 9mm w/ Thumb Safety IWB Holster RapidTuck™
Blackhawk CQC Holster noir H&K P30 droitier chez ASMC
The Bimmer Of Carry Guns: H&K P30SK | Shooting Sports Retailer