It will cost you more to buy mec boxes have them ship and them pack and reship. Few good sources for boxes. Auto Dealer parts depatment. They have a large assortment of sizes. vacuum cleaner boxes. I have been putting the loaders I have sent out or sold in heavy plastic bags place in box big enough with all the parts. Then I use expanding spray foam insulation to fit snug....careful now just a touch in the corners. The easy expand stuff for around windows, not as strong. If looking to save money you cant let them pack and ship for you, up side to that they have no bail out if it gets damaged in transit. Just went through that, "packaged not packed correctly"