I bought a covered litter box especially for the chickens. The hens love it and use it more than any of their other nestboxes. ETA: Egg cartons can be purchased from eggcartons.com or do what I did. Ask friends and co-workers to save theirs for you. I'm overloaded with cartons now.
Coopedup : haha, thats cool. well i will try that litter box thing. haha. They seem to prefer it because it's enclosed and darker inside. They like a dark secluded place to lay.
5 gallon buckets on their side. The cheapest eggs cartons for me are free ones from friends or buying them at the feedstore. Imp
I use these. The can stack. But I put them side by side. I have 4 for 13 hens, but they only use 2. Ps. I got them at Lowe's for less than $8.00. each.
I had 2 of the large size litter boxes but my cat got too big for them. [ended up using a very large rubbermaid tote for the litterbox] I wish I had read about using the litter boxes for nesting boxes before we built some.