ORIGINAL: ipscshooter
I don't thinkthat there are any free-ranging herds of buffalo in Texas. So, if you're opposed to high-fence hunts, you'll probably have to look elsewhere.
This place is near Abilene:
http://buffalo-mountain-hunts.com/index.php?show=buffalo
They claim to not be "canned hunts", but, that may depend on your personal interpretation. They say its "thousands of acres" so that mitigates against it being called a "pen" or a "canned hunt" in my opinion. But, there are low fences, and I don't think buffalo can jump a low fence, although they can undoubtedly run through one if they want... And, they all but guarantee your success.
Good luck!
I drive right by this place about once a week. The land that I hunt on is just on the other side of this place and I have seen the buffalo out there several times ( as well as elk ). I don't know much about buffalo hunting, but I know there are buffalo out there!