Okay, since my thread got so big.. a new question.

I am running out of the cartons I held onto before I got the chickens, as they also get weak...
What are the best cartons if I want to order some online- the cardboard ones, or foam?
I plan to reuse them as much as possible before I break down the cardboard ones and compost them out, or use them for planting seedlings. The foam, not sure what those can turn into... maybe give them to the kinder teachers for projects?
So my question: If I order egg cartons- which do you think is better... cardboard or foam. And please don't suggest plastic, that would get insanely expensive!

Thanks!