As mentioned above, I try to keep the finished dimensions of the box as small as possible to minimize shipping cost but still provide the needed protection. I usual find a box long enough and then modify it for what I need. Boxes for long flourescent lights work good, or something similar. I usually end up reinforcing the ends by stapling in some pieces of particle board. I put the bow in a good heavy flannel or fleece bow sock, then wedge pieces of scrap styrofoam all around the bow so it will not slide around in the box and then glue the chucks of styrofoam in place. Once the top is fit, I use reinforced banding tape very liberally to make sure everything is secure and tight. Usually takes me a good 45 mins to an hour, I end up with a light sturdy box that usually costs around $15.00 insured to ship - depending on location.