I use heavy cardboard boxes made for shipping flat screen TVs. They are large; up to 60" on the diagonal, and you can get two shipping cases out of one if you cut it right. They usually come with heavy molded foam impact corner braces which are also good to wedge the items in the box. You can usually find them at any moving and storage outfit; self-storage yards are great sources to find them. A large 60' diagonal is around $23, smaller size down is about 44" at about $18. Using a cardboard box within on of these along with foam wrap or packing peanuts (a PITA)) and you are good to go.
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