You know what they say;
"If you want it done right you have to BUILD it."
Start at Home Depot buy some 1" x 2" Strapping build an over sized frame,
Then buy two Wardrobe boxes from a moving company (or UPS),
Break the boxes down to suitable pieces and line the wooden frame with the cardboard.
Tape, glue, nail and screw to desired level of security and ship as required.
Any Questions; refer to the thread on 'Cannot Ship BS'
Happy Landings