For sale: assembled but unused large heavy duty double wall FedEx box: 28x28x28 inches. Seven dollars (new is $15).
If you want to ship something with ultimate protection, I am also selling a FedEx large, heavy-duty double wall box that is 24x24x24 inches, assembled but never used, that will fit inside the larger box with cushioning all around.
I will sell both for $13 and the cushioning is free.
Of course these must be picked up and cash only, please.