These are thirteen banker's boxes. You can find them at any office supply store or at Wal-Mart/Target/K-Mart/etc. I bought big packs of them and got them for a nice low price. :3 You have to assemble them yourself, but once you get the hang of it they aren't all that bad at all. (Though if you're anything like me you'll feel really dumb after realizing how easy it actually is).
After assembling the boxes I just sorted out my fabrics by color, cut a little swatch of each fabric that was in a box and hot-glued it to the outside of the box, so I'd know what was in each box. I can also make notes beside the swatches, such as what I'm using a fabric for, if I'm low on it, etc. I also have each box clearly marked, ie "Orange furs" "Pink, Red and Orange fleece", etc.
