When I have really big or odd sized large items, I usually make my own box--it's much cheaper. Most appliance stores will gladly give you washer/dryer/refridgerator boxes. You can also buy very large sheets of cardboard from places like Mailboxes, etc... Once you have the cardboard, get out your ruler and cutter and get to work. It's really not hard at all and you will save so much $$$ on having someone else package it for you!
Liz