Maybe look up Moore maker knives. I think they are out of Texas. They have a nice crossdraw sheath, are sold on Craig Camerons website
Chris French has one, he is a mule guy in southern Iowa.
I have some mules myself out of his jack.
What part of the state are you in? I am way northwestern part of the state.
If you are near Boone look up Max Brower or I can get you in contact with him. His knives are not cheap but are as good as you can buy.
If nothing else suits you I could make you one. Some say they are pretty good.
Let me know if I can help.