JT - I may not be answering the question you're asking but I'll take a stab at it.
If you're looking for real time data for cattle futures the easiest place would be the Chicago Mecantile Exchange website. For real time auction prices, you could probably google that and find something that would help you. Most buyers are working off orders from their respective clients and there are a great many variables that would factor into what they are willing to pay for cattle -particularly transportation costs. A lot of folks monitor what goes on at the major terminal markets and those usually give a good indication of which way things are going. Of course, there exists another set of variables that can result in dramatic price differences from region to region - not the least of which is the weather.
The bottom line is always the same - anything at an auction (cars, furniture, cattle, what ever) is only worth what two people are willing to pay for it until one decides its too high.
BB