I recently picked up some storage trays from Gamecraft Miniatures and I am really quite pleased. The are $9.00 a unit and come disassembled. They are laser-cut MDF so be prepared for a faint odor like a house-fire for the first few days.
Assembly is pretty strait-forward as the pieces are all cut to fit. There is an assembly video on the Gamecraft Website if you are truly confused. The most complex part of assembly is probably the two long pieces
Ones the sides were complete I assembled the boxes and made a 'frame' using several old text books to ensure adequate support on all sides so it would dry square.
You'll note the side's are marked with the company website on one side and "tank transport" on the other. I thought about reversing the sides to hide the markings, but only one side of the wood is plain, the other shows a wood grain. I am not opposed to using them as tank transports, but I found they were better suited to my 6mm ancients
The trays are about 27mm deep, 25mm with one of the two foam pads provided. This is more than deep enough for most based 6mm figs, with the exception of my Baccus Pikemen and Lance armed cavalry. I just ordered a few more, and will probably pick up some of the lids as well. In some of the website videos you can see larger versions of these in the background, although they do not appear to be available for purchase.