I got mine at Nasco. (
http://www.enasco.com/ProductDetail.do?sku=C18949N) They're about half the price they charge at McMurray's... really, I've found Nasco is very reasonable on everything compared to McMurray's and the other hatcheries. Good customer service, too.
However, these are still pretty expensive: 25 bucks (or 22 each if you buy a few). I imagine I could have worked over a plastic bin for a lot less, but in order to get it just right and removable like this one is, I think it would have been a LOT of work, and the plastic would definitely not have been as sturdy. Also, I like the way these are sloped on the top so the birds can't roost up there. So... they are expensive, but no rusting out; they'll last forever. Still, I've seen lots of good makeshift nest boxes. I don't think you really need anything fancy. My coop is small, though, so I only needed to use one.
Nuchickmama, I didn't think you were implying your hens were sleeping in your nest boxes
, I was just responding to Saltiena's question about whether it would be okay or not. It's kind of counter-intuitive, though, isn't it? Seems like the birds should sleep in their nests... but, no, we don't want them to.
I wish I had more than one room in my coop, like you do.