In used boxes I think they can be one of the better deals out there. Not as common as the mechanic's boxes, but not as well known outside of machining/manufacturing circles. I've yet to put more than $300 into one, condition ranging from needing repaint and heavy cleaning (gov't auction, out in the weather) to wipe it off and use it minty huge Vidmar factory built roll-around (5' long drawers, 28" deep).

Of course that last two that were the best deals popped up when I wasn't looking for them. And you usually can't pick your ideal set of drawers. I have had some luck on ebay, there's one group (motorhead something or other) that has new scratch and dents pretty reasonable. Have bought from them for day job.

Rob