Can I buy gift cards at the box office?

Yes you may

You can get cards from most places that sale gift cards such as Lowe's or Safeway but I'm not sure if they sale them on site.

Honestly I don't know but at Certain stores you can buy their gift cards I would just call I believe I got my gift card for AMC at Safeway?

I believe you have to go to their website? They also have a club called stubs it's amazing