Hi Jerry,
If you can't buy one, then you're going to have to make one.I guess.
If you can scrounge a big old box from some appliance store you should be set if its big enough.Just use the case to mark out the front , back , n sides, score the cardboard n bend...leave extra at each end for the ends.
If you want protection in between, some glued flat slabs of 1" or so polystyrene here n there would give it some space ? ( but allow for it when measuring cardboard )..or wrap it in some carpet scraps?
Necessity is a Mother, as they say.
Lettuce know how you make out,
cheers
franc