NACS DC Adapter

Hey fellow bolt owners. I am wanting to purchase the adapter so that I'm able to charge at the Tesla charging station since I have so many of those around me. I unfortunately have never been able to get the myChevrolet app to work and it seems like that is the only place you can buy the adapter through. I have contacted onStar multiple times and they are not helpful. Does anyone have any idea of how to purchase the adapter not through the app or if you have any other recommendations on where to purchase an adapter (I would appreciate links!)

Thank you!!!