You can use leather from game animals either flesh-side out or grain-side out.
In German the generic name for suede is Game-leather (Wildleder), indicating that originally all suede leathers came from game animals. There is still plenty around (bred in New Zealand) to provide the raw material for those highly treasured, long, embroidered lederhosen (Hirschlederne).
Game leather is also used grain-side out, Italian "˜Cervo' is a rather soft leather with a gentle texture, frequently used for moccasins. Kudu is an African antelope whose leather (grain-side out) is used for it's more flamboyant texture. Here is a pair of (bespoke) Gaziano/Girling monks in Kudu, which were made for forum member TimelessRider.
I don't know about the price, it can't be as expensive as crocodile as Grenson and Alden offer (or have offered) some boots in Kudu, with no added premium. I suppose to get a mirror-match of the texture, there is more waste.
Church's used for decades "˜Genuine Cape Buck' another antelope but this time with a suede texture.
Do you want your game leather shoes in suede or grain leather?