Calhoun, as far as I know the scimitar horned Oryx is extinct in the wild, and all animals in existence are owned by someone. The trophy is measured by length, and mass of the horns.
There are many game ranches that have them, some very large ranches, and some smaller, but I don't believe you will find them except in a high fence operation, because they are very valuable animals. Predators, and poachers must be kept away from these type animals, so most of the high fence areas are in the interior of large ranch properties, with no access from from a public area like a highway, or public road.
Some will give you grief about the high fence ranches, but if you want a Scimitar horned Oryx it is likely that is where you will have to hunt. Any hunt is what you make it, and with a little looking around you can find an operation that will allow you to hunt on foot, or anyway you would find more or less ethical. However that is your call, not the public's!
PS; The meat is some of the best wild meat I have ever tasted, and well worth processing for the table!
EXOTICS
2 DAY HUNTS
AXIS LESS THAN 30" = $1,800
AXIS 30" - 33" = $2,000
AXIS OVER 33" = $3,000
BLACKBUCK UP TO 20" = $1,500
BLACKBUCK OVER 20" = POR
SCIMITAR-HORNED ORYX = $2,500
The above are examples of scimitar horned oryx, and ball park prices!