I saw this for sale on a site in the UK last year and thought it looked interesting. I just saw it was available in the states now. Most people make their own, but some people buy theirs, so I thought I'd post this link. Roll away nest boxes come up as a topic from time to time, too. They have a roll away and a non-roll away version.
I think that yellow version is so cheery!
http://www.premier1supplies.com/detail.php?prod_id=78703&cat_id=165
I think that yellow version is so cheery!
http://www.premier1supplies.com/detail.php?prod_id=78703&cat_id=165