Desantis Holster is an online store for inside the waistband holsters, pistol holsters, Taurus, pistol, pancake holsters, holsters for springfield XD, walther, handgun, GLOCK IWB, GLOCK 22 and leather holsters for 1911.
Some companies have fewer options for lefties. I have found that Alien Gear, CrossBreed, HiddenHybrid, and Alabama Pocket have always been happy to make the left-handed products I desired. Galco refused to provide a left-handed version of one of their holster I wanted, but I do have one left-handed Galco that I like a lot. Azula seems to make most of their products available for lefties, and their leather seems to be good quality.