How do I buy tickets for Houston musicals?

Specifically Hadestown Jan 4-9.

I keep looking at various sites like Broadway at the Hobby Center. I feel like I keep going in circles and can never actually find a place to purchase individual show tickets. I know and see you can sign up for a season package but I’m only interested in seeing one (maybe two) shows. Does anyone know if these are on sale yet? Or when they would be? And what I need to do to purchase tickets for an individual show?