I'm not what you'd call an old hand at this but I thought I'd share what works for me. I deliver groceries to grocery stores and I'm in different stores all the time. One of the things they have a hard time dealing with are the large bins that hold potatoes, apples, watermelons, and other types of produce through the year. They don't want them in the garbage but they won't fit in the cardboard bailer unless they are cut up into much smaller pieces. If I see one alone and need it I have never been turned down when I ask if I can have it. These bins are made of double thick cardboard and 48"LX40"W and 2 1/2' tall. When I get them home I put wood chips in them and they make perfect brooder boxes. Try asking your local market manager and see if they'll let you have some of theirs.