I'm very pleased with the pocket holster products Sam Andrews makes:
http://www.andrewsleather.com/
I carry my P 32 in an Andrews Pocket Holster, and use his McDaniel special for my primary gun.
Unfortunately, he's a custom manufacturer, and he hasn't made any for the MK9 lately, well at least since I bought mine (just my luck). I'll buy one from him when he makes one. He did have a wallet style holster in stock for the MK9 and it fit very well. I just don't like back pocket style holsters. I have a couple, but never got used to sitting on a gun.
I'm carrying my MK9 for now in a High Noon "Pocket Grabber" holster:
http://www.highnoonholsters.com/
Not that looks matter, I think the rubber anti slip coating looks silly, workmanship and quality isn't nearly as good, and it doesn't fit nearly as well as an Andrews product, BUT the High Noon product *is* readily available, where his aren't. I'm into instant gratification.... so I'll eventually own both.
Sorry I didn't see your post earlier, hope I was able to help a little.