Zack White (
www.zackwhite.com) is probably the best source for hides that there is. They have a huge selection, and the prices are probably at least as good or usually better than Seigal
They have just about any leatherworking tool or supply you can imagine as well.
They also have holster kits. They are stamped out into popular patterns for popular size guns already. You just sew or lace them together. You can usually modify the kits to fit guns other than what they were designed for.
If you look at their kits, as well as their finished gunbelts, you will quickly figure out who makes holsters as well as "Ranger" gunbelts for Bianchi