Hello, I am Thomas, owner of Old Faithful Holsters. My site is at http://www.OldFaithfulHolsters.com
. We sell Glock (and many other) IWB leather Kydex hybrid holsters for $35. I use 7-9 oz leather and .093 Kydex so they are quite sturdy.
We also sell kits to make your own holsters for any gun for $20. They come with leather, Kydex, and all associated hardware. You can even make a holster to fit your gun with a light or laser on the rail. I have free instructions on my website at http://www.oldfaithfulholsters.com/tutorials.html
The tutorials are free and it is not necessary to purchase a kit to view them.