I did a search at USG and GoldBond. I came up with nothing. That does not mean they don't or can't make it. Since you want RockLath you must intend to plaster so have you thought about cutting blue board to RockLath dimensions and using that? Lath was 16" X 48" you could just cut blue board off the ends. I bet if you stacked it precisely and used a masonry saw you could cut through two or three bundles of board at once and that would give you a lot of sheets of lath in a hurry. I don't know what you would do about the raw edges though. Nothing works quite as nicely as RockLath. Try the gypsum suppliers and see if they can get it for you.