I found this guy on Etsy. He makes these sheaths for $35 for any knife you have. I really like the blade retention and the looks of it. If he doesn't have your knife. You can send him yours and he'll custom make you one for the same $35.
https://www.etsy.com/listing/492167181/buck-knife-fixed-blade-sheath?ref=shop_home_active_9
https://www.etsy.com/listing/492167181/buck-knife-fixed-blade-sheath?ref=shop_home_active_9