I just got my CWP and bought my first holster on gunbroker a few weeks ago.
I lucked out on a new left handed IWB Highnoon Downunder for my S&W M&P Compact. It was about $50.
It's very comfortable and the "rough side out" REALLY holds it in place. The tension screw is also a very nice feature.
My M&P loves its new diggs: