Flywilly, The best bet is through the US post office for these. You can get boxes for free and the cost is a lot less then other means of shipping. Best thing too is any people who are out of the US will get better rates too since they ship international at very reasonable prices. You can also do all of your shipping labels from your PC here:
http://www.usps.com/tools/calculatep...lculatepostage

You will even save a little by doing this online. You just print the label, tape it to the box and drop it off. If you really want to make it easy.... they also have a "Flat rate" box. That means what ever you can put in it..... the price is fixed. Just go to the post office and take a few minutes to ask about the flat rate boxes and there cost (I do not know off the top of my head) and pick up some boxes to gear up for sending these. Hope this helps.