Can i purchase tikets for franco escamilla at the theater ? And how much is the cheaper one and what time

You can purchase tickets at the theatre, but at your risk. It's always better to buy ahead of time.

You can purchase tickets at the theater, however it's usually cheaper to get them ahead of time unless its a last call situation. But you also may risk it being sold out.

Call them the box office is open during the day.

The theatre does have a box office, the hours of operation are posted on the website also.

I don't see why not. I don't know which would be cheaper unfortunately.