This is a really great product, and I haven't found it anywhere else. If you have animal pens, you need this. It is heavy duty and the vinyl coating really holds up.
Two suggestions: 1) if you are nailing it to wood framing, use electrical type staples (square on the ends). Much easier to pound in than the rounded ones, and I think they even cost a little less. 2) if you are keeping small animals in, be sure to extend the fabric at least a foot out on the ground (2 feet is better) away from all sides so predators aren't prone to dig their way into the pen under the fabric. Pin it down, or better yet, put heavy rocks or gravel on it.