There's a guy in/near San Diego (California) named Billy Lang who does saddles etc and also fantastic sporrans.
He's on Facebook but I just checked his page and he doesn't have any photos of his sporrans. They're a sideline for him.
You might be better off with a fulltime sporranmaker, hopefully somebody will chime in with one.
Proud Mountaineer from the Highlands of West Virginia; son of the Revolution and Civil War; first Europeans on the Guyandotte