DAZ has one for 20 bucks. Not sure how good it is - it's pretty old (Poser3, I think) and perhaps that other place that specilizes in animals, Vista-something-or-other, don't remember the name and can't locate the link right now. I'm pretty sure I saw a whole herd there (well, maybe not a herd but at leat a few head) (...memory is the second thing to go)