So, I know it's expensive, but my White Hat holster finally came in, and it's amazing.
Ever since I got the PF-9 I thought somehow it was still too big to conceal. The Uncle Mike's holster printed in just about everything I wore. I had to wear it at a 5 o'clock position just to get the blatantly obvious printing to go away. 3 o'clock was entirely out of the question unless I wore a jacket or vest.
Now, with the White Hat, I'm wearing it at the 3 o'clock position and it's 90% invisible to me, and 100% invisible to my girlfriend. So, I'm just throwing this out there, but it was worth every single penny. Not to mention, I will be able to replace the Kydex whenever I upgrade to another gun (next gen PF-9, maybe a M&P Shield, etc) without having to buy an entirely new holster.
Weigh your options. You might spends $30 on a holster that will get you by, but you may still have problems with concealment. Whereas you can get a hybrid for $55-$70 and be completely satisfied. If the $30 holster works, awesome, you saved money. If not, you're out $30 and you'll have to spend even more down the road.
Just my $0.02