Corrugated box
It used to be that if you needed boxes for something you could pop over to the local grocery store or NSLC and pick up the boxes you need. Now it's not so easy, the stores either have already given them away or they've cut them down for recycling. If you need a large quantity of quality boxes, check out this link where they have great deals on corrugated boxes. No matter if you want boxes to move with or if you want them for storage, they have all of them and a great assortment. Right now there are over 125 items on sale, so I'm sure you can find what you need with no problem at all.