I've seen a pic of one here in Texas. If you do find one to hunt it's likely going to brought fresh from the breeder or auction floor and dropped on a ranch. And also I can almost guarantee that it's going to cost arm and leg to shoot one here.
Id love to see breeding herds of Hartebeest in Texas though.
Need I say more? Also, some of the outfitters have truly civilized accommodations. I hunted with Africa Awaits and can highly recommend the facilities without reservation: