Serpas can be had off ebay for about $35US new. I have one for my 1911, and like it. I have an Uncle Mikes for my P99 (and a Fobus) and like it. Have a Fobus for my CZ and had one for my NP34 (don't have it anymore either) and don't care for it, particularly. Most I have set up as paddles, and all paddles had to be modified to work well, including the Serpa. They can belt loop as well. My fav IWB is Don Hume at $27 US (Cheap) - comfortable, works.
I have a Galco NSAII IWB for 1911 for sale, nearly new.