Glock Sport Combat Holster
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I can't believe no one has mentioned the Glock Sport Combat holster yet, it's around $14, and has great retention and keeps your glock very high and tight to your body. It's plastic and looks like a cheap piece of crap, but works REALLY well.
I use it in conjunction with a Beltman double layer bullhide belt, and even under a loose t-shirt my glock 30 just disappears.
I would not consider that too much for a nicely made holster. It is possibly to pay $350+ on a simple leather holster.I've paid $100 for VM2's, and $60-$75 for other custom made leather holsters.