Yep, one of those cages prob better! I got mine from the garden section at my local drug store, but you can probably still get it in harden centres or online. They took a good few weeks to emerge. I also found that about half emerged with crumpled wings and died within a few days, which a couple of other members said they experienced too.
The moths are awesome, you'll love them. They are nocturnal and if you shine a light on them at night, their eyes glow! And if one escapes at night it will loom at you out of the dark, eyes blazing and wings throbbing like a helicopter, while you're watching TV and you'll never sleep again.