I bought this several years ago:
PoultryNet® Plus 12/48/3 (100' x 48" white/black roll), double spike Item #207018
I don't use it for keeping chickens in, I use it for keeping all the woodland creatures out, and it has worked very well. Make sure you get the one with extra stout and/or double the number of poles, the poles tend to bend.
Make sure your electrifier is up to the task, since the bottom line of the fence is pretty much always in the grass for me. (I take mine down and put it up every pear season, I don't keep it up year round, and while it's up it definitely makes a line of dead grass where it touches the lawn).
While it won't keep squirrels and chipmonks out, it seems to work well against the deer, porcupines, raccoons that all want my pears.