I made my own from supplies obtained from knifekits.com.

One piece of leather cut to size
One piece of Kydex also cut to size
Heat Kydex in oven or with a heat gun until soft and slightly floppy
Press Kydex over firearm with foam or a towel or something that will conform.
Rivet or fasten Kydex to leather, trim excess bits, and smooth all edges.
Ta-da a very nice custom fitted IWB holster for a very reasonable price!
I'll post pics tonight.