call this guy, you wont be sorry
claude smith
307-663-7645
like manboy said, he is about 30 miles south of newcastle wyoming. he probably wont do any more this spring, he usually shuts down in febuary, because the hides start rubbing off, and ya want a good hide to tan. i dont know what he will charge next fall/winter, but im sure he will be one of the most resonable around, and he has some big animals. i dont think he uses anything other than just the prairie grass (he has like 16,000 acres) and cake for feed.
best tasting meat i have ever tried, and he is a helluva nice guy, give em a call

brad