All the portable fences I've seen in the various pet stores up here have come in a variety of heights, starting at 24 inches and going up to 56 or 60. Mine is quite high...probably 48 inches (I can't bend over it to open the drawers in the chest it protects) and I know there was one higher yet.
Maybe you should call the pet stores in your area first and ask them if they have the fencing before you make the trip.
I hope this helps.