I used a guy called Marion Poff. He was very reasonable with his prices and has many knives so you don't always have to send him yours. The sheath he made for me seems to be very good but he took a more time than expected to get the thing to me.

He does not have a great website. It's more of a blog listing his offerings. See: http://marioncarry.blogspot.com/2009/12/recent-sheaths.html