I've picked a few of these "Really Useful Boxes" at Staples recently and I kind of like them. They come in various sizes and can hold Wackys and other trading cards.. They stack together nicely. Pretty cheap, 1- 3 bucks depending on the size. (not as cheap as cardboard boxes but they look good on a shelf.
[expando]http://photos.smugmug.com/photos/1009915286_wCU5X-XL.jpg[/expando] [expando]http://photos.smugmug.com/photos/1009919002_Vdw3w-XL.jpg[/expando] [expando]http://photos.smugmug.com/photos/1009915213_E9EmT-XL.jpg[/expando] [expando]http://photos.smugmug.com/photos/1009915386_Nkz3R-XL.jpg[/expando] [expando]http://photos.smugmug.com/photos/1009915420_SBRNy-XL.png[/expando]