We visit a farmer's market every Sunday, and there is a stand there that makes really, really yummy pizza in a brick oven. They don't provide takeaway boxes, everyone just eats there at the market. This would be fine, but I try to get there as soon as they open because some of my favorite things sell out fast, and I'm not ready to nosh on pizza at 9am.
Anything that traps the steam (like a glass container) would make the crust soggy. I found this http://www.goodnewsreuse.com/the-pi-pan.html but I don't think they are being sold (the last post on their blog is from 2011).
Any ideas? I can't be the only person who wants a reusable, non-plastic container to bring home pizza!