Ha ha ha.
Really, a few custom shops do exotic game or leathers. Galco, El Paso Saddlery, Del Fatti, Kramer, Mitch Rosen, Ken Null.
I've heard a lot of + feedback about horsehide, bullhide.
There are other types available but it's custom. Snake, alligator, rhino, shark, etc.
The firearms you want may require a custom shop. Plan on a long wait too. These firms are small & take months to fill.
Clyde
PS; Josh Bulman's site & holsters were top-rated but the company seems MIA as of 12/2012. Any TFL members know what happened with Bulman?