I try to run on a lowest cost/benefit ratio. Some things I have a hard time making for myself, but often I try to build things instead of buying them, as it saves a bit of money. Holsters are one of those things. For the cost of a good leather holster, I can buy enough raw leather to make 5-6, depending on the design. The following pics are of a holster I built for a friend in Arizona.
This is a finished view of a belt slide OC holster for a Berretta PX4 Storm 9mm. Its a full size, double stack 9mm, with a polymer frame. Interesting gun, its a polymer version of the Stoeger Cougar, with a Rotating barrel locking mechanism, rather than the Browning style tilting barrel. I didn't get a chance to shoot it, but I hear the holster is holding up well.
Above: PX4 in holster at 3:30 position, just behind the hip. This is the most comfortable driving position.
Right: PX4 and finished holster.
Notice that the holster is a thumbbreak model, with a completely enclosed trigger. The sights are protected, and the safety is also covered. The magazine release is not covered, but I have not had any reports of a mag dumping. I built a very similar holster for my Ruger, which I wear pretty much constantly. I have not had any problems with it to date.
I wear mine just behind the point of the hip. It's a double loop design, with one loop behind the body of the holster, and the 'tail' loop to maintain the degree of cant. Its built with a minimal amount of forward cant, which winds up sitting almost perfectly vertical when seated. I found this design to be the most comfortable holster to wear, of any I have used to date.
As far as construction, that's an entire new post. I use top grain 7-9 oz leather to build these, with brass rivets and snaps. All laminations are made with contact cement; I didn't even stitch mine, and its been holding up very well.
Cost of materials is hard to define, but its certainly less than buying a holster. The last single shoulder I bought cost around $60, and so far I have built 3 holsters, a double mag pouch, and still have quite a large piece left over. As a plus, the holsters I make are all fully formed, and built on an individual basis, with custom specs for height, belt slot, and cant.