If it’s literally the only option, and you HAVE to do it just use the type N from Menards. You can add a plasticizer, (they call it Concrete Bonding Agent, which again, isn’t really the same thing as what you want, but works in a pinch) which will help keep it a bit more elastic. Do a Google search for County Materials. I’d be willing to bet if you have Menards near you, there is probably a County Materials as well. They can get you the good stuff.