There are lots of outlets for both leather and Kydex. Tandy Leather is one, Jantz Knife supply (Davis, OK), & Texas knife supply are just a few right off hand. Kydex is a plastic that comes in sheets. You can heat it up in an oven, toaster oven, or with a heat gun, then shape it around your knife, very versatile! It looks good with 550 cord and micarta (or any similar type) handles. But I still like leather for any natural type handles, like wood, antler etc.... :)