Maybe it doesn't bring it up for you because it reads your location and your home depot doesn't have them??? I just clicked on the link and right next to the portable shingle thing, it lists the cattle panels for $25. If you put in a zipcode for Prescott area (change store location), I think it will bring it up for you as the browser will have your location saved for the Prescott Home Depot. Pick the Prescott store and then do a search for cattle panel if all else fails.
My panels are 4' tall and 16' long, 4 gauge, with the squares on the panel 6"x8". When I arch it, I can easily walk under them. They are pretty heavy duty and difficult to manage with one person. For those of you looking for these, it might be cost effective to drive to get them if they are $40 where you live. Just make sure they have some in stock.